Question

Даю 20 (кхм-кхм......) Пж помогите просто завтра ещё и контрольная, спасибо заранее: 1) {3(x-2)-2(y+1)=-1 {5(x+3)-8(y-2)=42 Смотреть ответ Timonent Timonent {3(x-2)-2(y+1)=-1 {5(x+3)-8(y-2)=42 {х=7/3+2/3y {5(x+3)-8(y-2)=42 5(7/3+2/3y+3)-8(y-2)=42 y=1/7 x=7/3+2/3*1/7 x=17/7 (x,y)=(17/7,1/7) блин спасибо спас Новые вопросы в Математика надо так поставить + - ÷ × () между 4. 3. 2. 1 чтобы вышло 12 ​ Помогите ответить вставь число 4/6 = /3 Пж срочно помогите!!! 2. В книге пронумеровали страницы. На это потребовалось ровно 107 цифр. Сколько страниц в этой книге? _) 55 B) 56 C) 57 D) 58 E) 59 Помогите пожалуйста даю 30б Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. КОМПАНИЯ Блог Карьера Условия пользования Авторское право Политика конфиденциальности Предпочтения cookie-файлов СООБЩЕСТВО Сообщество Brainly Brainly для школ и учителей Сообщество родителей Кодекс чести Правила сообщества Brainly Insights Стань помощником ПОМОЩЬ Зарегистрируйся Центр помощи Центр безопасности Договор о конфиденциальности полученной информации Установи приложение Brainly Скачай iOS-приложение Скачай для Android Школьные Знания.com PL: Brainly.pl ES: Brainly.lat PT: Brainly.com.br FR: Nosdevoirs.fr TR: Eodev.com RO: Brainly.ro ID: Brainly.co.id HI: Brainly.in PH: Brainly.ph US: Brainly.com (function() { window.process = window.process || {}; window.process.env = { NEXT_PUBLIC_PAYMENTS_ENDPOINT: "https://znanija.com/graphql/ru", NEXT_PUBLIC_HEADER_TOKEN_LONG: 'X-B-Token-Long', NEXT_PUBLIC_COOKIE_TOKEN_LONG: 'Zadanepl_cookie[Token][Long]', NEXT_PUBLIC_MARKET: "ru", NEXT_PUBLIC_BACKEND_MARKET: "ru", NEXT_PUBLIC_SPREEDLY_PKEY: "", NEXT_PUBLIC_PAYMENTOS_PKEY: "7a985100-4936-430e-83cf-af6ea914af9b", NEXT_PUBLIC_STRIPE_PKEY: "", NEXT_PUBLIC_BRAINTREE_PKEY: "", }; window.jsData = window.jsData || {}; window.jsData.domain = 'znanija.com'; window.jsData.siteName = 'Школьные Знания.com'; window.jsData.dateFormat = 'd.m.Y'; window.jsData.footerConfig = {"socialMedia":[{"icon":"youtube","url":"https:\/\/www.youtube.com\/channel\/UCQ929YFR7IGeKlv-nXn-Qug?view_as=subscriber","ariaLabel":"youTube link"}],"company":[{"titleTranslationKey":"blog_footer_link","url":"https:\/\/blog.znanija.com"},{"titleTranslationKey":"careers_footer_link","url":"https:\/\/careers.brainly.com\/"},{"titleTranslationKey":"terms_of_use_footer_link","url":"https:\/\/znanija.com\/pages\/prawila","noHref":true},{"titleTranslationKey":"copyright_policy_footer_link","url":"https:\/\/znanija.com\/avtorskoe-pravo"},{"titleTranslationKey":"privacy_policy_footer_link","url":"https:\/\/znanija.com\/pages\/politika_konfidentsialnosti"},{"titleTranslationKey":"cookie_privacy_footer_link","handlerKey":"cookie_privacy_footer_link"}],"community":[{"titleTranslationKey":"brainly_community_footer_link","url":"https:\/\/znanija.com\/soobshestvo"},{"titleTranslationKey":"for_schools_teachers_footer_link","url":"https:\/\/znanija.com\/shkola-i-uchitelia"},{"titleTranslationKey":"brainly_for_parents_footer_link","url":"https:\/\/znanija.com\/roditeli"},{"titleTranslationKey":"honor_code_footer_link","url":"https:\/\/znanija.com\/kodeks-chesti"},{"titleTranslationKey":"community_guidelines_footer_link","url":"https:\/\/znanija.com\/pravila-soobshestva","noHref":true},{"titleTranslationKey":"brainly_insights_footer_link","url":"https:\/\/brainly.com\/insights"},{"titleTranslationKey":"become_a_volunteer_footer_link","url":"https:\/\/znanija.com\/volontery"}],"helpColumn":[{"titleTranslationKey":"signup_footer_link","url":"https:\/\/znanija.com\/signup?entry=1","noHref":true},{"titleTranslationKey":"help_center_footer_link","url":"https:\/\/faq-ru.brainly.com"},{"titleTranslationKey":"safety_center_footer_link","url":"https:\/\/znanija.com\/centr-bezopasnosti"},{"titleTranslationKey":"responsible_disclosure_agreement_footer_link","url":"https:\/\/brainly.com\/responsible-disclosure-program"}]}; window.jsData.styleGuideAssets = { logo: { small: 'https://styleguide.znanija.com/images/logos/znanija-mobile-200611d052.svg', big: 'https://styleguide.znanija.com/images/logos/znanija-addd85e6f5.svg', plus: 'https://styleguide.znanija.com/images/logos/znanija-plus-337423fa26.svg' }, application_icons: { x180: 'https://styleguide.znanija.com/images/app-icons/znanija/180x180-1c0ebd78f4.png', } }; window.jsData.staticDomain = 'z-dn.net' window.jsData.displayAdsEnabled = false window.jsData.videoAdsEnabled = false window.jsData.newestQuestions = [{"id":53191831,"content":"\u043d\u0430\u0434\u043e \u0442\u0430\u043a \u043f\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c + - \u00f7 \u00d7 () \u043c\u0435\u0436\u0434\u0443 4. 3. 2. 1 \u0447\u0442\u043e\u0431\u044b \u0432\u044b\u0448\u043b\u043e 12 \u200b"},{"id":53191796,"content":"\u041f\u043e\u043c\u043e\u0433\u0438\u0442\u0435 \u043e\u0442\u0432\u0435\u0442\u0438\u0442\u044c \u0432\u0441\u0442\u0430\u0432\u044c \u0447\u0438\u0441\u043b\u043e 4\/6 = \/3"},{"id":53191788,"content":"\u041f\u0436 \u0441\u0440\u043e\u0447\u043d\u043e \u043f\u043e\u043c\u043e\u0433\u0438\u0442\u0435!!!"},{"id":53191781,"content":"2. \u0412 \u043a\u043d\u0438\u0433\u0435 \u043f\u0440\u043e\u043d\u0443\u043c\u0435\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b. \u041d\u0430 \u044d\u0442\u043e \u043f\u043e\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u0440\u043e\u0432\u043d\u043e 107 \u0446\u0438\u0444\u0440. \u0421\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u0432\n\u044d\u0442\u043e\u0439 \u043a\u043d\u0438\u0433\u0435?\n_) 55\nB) 56\nC) 57\nD) 58\nE) 59"},{"id":53191762,"content":"\u041f\u043e\u043c\u043e\u0433\u0438\u0442\u0435 \u043f\u043e\u0436\u0430\u043b\u0443\u0439\u0441\u0442\u0430 \u0434\u0430\u044e 30\u0431"}] window.jsData.nearestQuestions = { next: { url: '/task/32298121', id: '32298121' }, prev: { url: '/task/32298117', id: '32298117' } } window.jsData.userLocationInfo = {"location":{"continent":{"code":"EU","geoname_id":6255148,"names":{"de":"Europa","en":"Europe","es":"Europa","fr":"Europe","ja":"\u30e8\u30fc\u30ed\u30c3\u30d1","pt-BR":"Europa","ru":"\u0415\u0432\u0440\u043e\u043f\u0430","zh-CN":"\u6b27\u6d32"}},"location":{"accuracy_radius":1000,"latitude":47,"longitude":8,"time_zone":"Europe\/Vaduz"},"registered_country":{"geoname_id":6252001,"iso_code":"US","names":{"de":"USA","en":"United States","es":"Estados Unidos","fr":"\u00c9tats-Unis","ja":"\u30a2\u30e1\u30ea\u30ab\u5408\u8846\u56fd","pt-BR":"Estados Unidos","ru":"\u0421\u0428\u0410","zh-CN":"\u7f8e\u56fd"}}},"ip":"66.249.81.33"} window.jsData.paymentsMode = '0'; window.jsData.styleGuideUrl = 'https://styleguide.znanija.com/'; window.jsData.androidAppUrl = 'https://play.google.com/store/apps/details?id=co.brainly&hl=ru'; window.jsData.iOSAppUrl = 'https://apps.apple.com/ru/app/id745089947'; // brainly store items window.jsData.subjects = [{"id":59,"name":"\u0423\u0445\u043e\u0434 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","slug":"uhod_za_soboi","icon":"personal-care","bestInName":"\u0423\u0445\u043e\u0434\u0435 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","filterName":"\u0423\u0445\u043e\u0434 \u0437\u0430 \u0441\u043e\u0431\u043e\u0439","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":29,"name":"\u041c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0430","slug":"matematika","icon":"mathematics","bestInName":"\u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0435","filterName":"\u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":17,"name":"\u041b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0430","slug":"literatura","icon":"literature","bestInName":"\u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","filterName":"\u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":30,"name":"\u0410\u043b\u0433\u0435\u0431\u0440\u0430","slug":"algebra","icon":"algebra","bestInName":"\u0430\u043b\u0433\u0435\u0431\u0440\u0435","filterName":"\u0430\u043b\u0433\u0435\u0431\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":16,"name":"\u0420\u0443\u0441\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"russkii_yazyk","icon":"russian-alt","bestInName":"\u0440\u0443\u0441\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":31,"name":"\u0413\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u044f","slug":"geometriya","icon":"geometry","bestInName":"\u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0438","filterName":"\u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":33,"name":"\u0410\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"angliiskii_yazyk","icon":"english","bestInName":"\u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":10,"name":"\u0425\u0438\u043c\u0438\u044f","slug":"himiya","icon":"chemistry","bestInName":"\u0445\u0438\u043c\u0438\u0438","filterName":"\u0445\u0438\u043c\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":9,"name":"\u0424\u0438\u0437\u0438\u043a\u0430","slug":"fizika","icon":"physics","bestInName":"\u0444\u0438\u0437\u0438\u043a\u0435","filterName":"\u0444\u0438\u0437\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":3,"name":"\u0411\u0438\u043e\u043b\u043e\u0433\u0438\u044f","slug":"biologiya","icon":"biology","bestInName":"\u0431\u0438\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u0431\u0438\u043e\u043b\u043e\u0433\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":42,"name":"\u0414\u0440\u0443\u0433\u0438\u0435 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u044b","slug":"drugie_predmety","icon":"others","bestInName":"\u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u0430\u0445","filterName":"\u0414\u0440\u0443\u0433\u0438\u0435 \u043f\u0440\u0435\u0434\u043c\u0435\u0442\u044b","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":13,"name":"\u0418\u0441\u0442\u043e\u0440\u0438\u044f","slug":"istoriya","icon":"history","bestInName":"\u0438\u0441\u0442\u043e\u0440\u0438\u0438","filterName":"\u0438\u0441\u0442\u043e\u0440\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":15,"name":"\u041e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u0435","slug":"obshtestvoznanie","icon":"social-science","bestInName":"\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u044e","filterName":"\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e\u0437\u043d\u0430\u043d\u0438\u044e","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":46,"name":"\u041e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0438\u0439 \u043c\u0438\u0440","slug":"okruzhayushtii_mir","icon":"environment","bestInName":"\u043e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0435\u043c \u043c\u0438\u0440\u0435","filterName":"\u041e\u043a\u0440\u0443\u0436\u0430\u044e\u0449\u0438\u0439 \u043c\u0438\u0440","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":8,"name":"\u0413\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u044f","slug":"geografiya","icon":"geography","bestInName":"\u0433\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u0438","filterName":"\u0433\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":37,"name":"\u0423\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u043c\u043e\u0432\u0430","slug":"ukrainsyka_mova","icon":"ukrainian-alt","bestInName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":32,"name":"\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0430","slug":"informatika","icon":"informatics","bestInName":"\u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435","filterName":"\u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":41,"name":"\u0423\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u043b\u0456\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0430","slug":"ukrainsyka_l_teratura","icon":"ukrainian-literature","bestInName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","filterName":"\u0443\u043a\u0440\u0430\u0438\u043d\u0441\u043a\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":44,"name":"\u049a\u0430\u0437\u0430\u049b \u0442i\u043bi","slug":"kazak_tili","icon":"kazach-alt","bestInName":"\u043a\u0430\u0437\u0430\u0445\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u043a\u0430\u0437\u0430\u0445\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":22,"name":"\u042d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0430","slug":"ekonomika","icon":"economics","bestInName":"\u044d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0435","filterName":"\u044d\u043a\u043e\u043d\u043e\u043c\u0438\u043a\u0435","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":48,"name":"\u041c\u0443\u0437\u044b\u043a\u0430","slug":"muzyka","icon":"music","bestInName":"\u043c\u0443\u0437\u044b\u043a\u0435","filterName":"\u041c\u0443\u0437\u044b\u043a\u0430","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":25,"name":"\u041f\u0440\u0430\u0432\u043e","slug":"pravo","icon":"law","bestInName":"\u043f\u0440\u0430\u0432\u0435","filterName":"\u041f\u0440\u0430\u0432\u043e","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":49,"name":"\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f","slug":"tehnologiya","icon":"technology","bestInName":"\u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":43,"name":"\u0411\u0435\u043b\u0430\u0440\u0443\u0441\u043a\u0430\u044f \u043c\u043e\u0432\u0430","slug":"belaruskaya_mova","icon":"belarus-alt","bestInName":"\u0431\u0435\u043b\u043e\u0440\u0443\u0441\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0431\u0435\u043b\u043e\u0440\u0443\u0441\u0441\u043a\u043e\u043c\u0443 \u044f\u0437\u044b\u043a\u0443","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":47,"name":"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"francuzskii_yazyk","icon":"french","bestInName":"\u0444\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":45,"name":"\u041d\u0435\u043c\u0435\u0446\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","slug":"nemeckii_yazyk","icon":"german","bestInName":"\u043d\u0435\u043c\u0435\u0446\u043a\u043e\u043c \u044f\u0437\u044b\u043a\u0435","filterName":"\u041d\u0435\u043c\u0435\u0446\u043a\u0438\u0439 \u044f\u0437\u044b\u043a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":50,"name":"\u0427\u0435\u0440\u0447\u0435\u043d\u0438\u0435","slug":"cherchenie","icon":"geometry","bestInName":"\u0447\u0435\u0440\u0447\u0435\u043d\u0438\u0438","filterName":"\u0427\u0435\u0440\u0447\u0435\u043d\u0438\u0435","occupants":0,"rankable":"1","enabled":false,"sponsored":false},{"id":51,"name":"\u041c\u0425\u041a","slug":"mhk","icon":"art","bestInName":"\u041c\u0425\u041a","filterName":"\u041c\u0425\u041a","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":52,"name":"\u041e\u0411\u0416","slug":"obzh","icon":"security","bestInName":"\u041e\u0411\u0416","filterName":"\u041e\u0411\u0416","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":53,"name":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u044f","slug":"psihologiya","icon":"psychology","bestInName":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u0438","filterName":"\u041f\u0441\u0438\u0445\u043e\u043b\u043e\u0433\u0438\u044f","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":54,"name":"\u041e\u02bbzbek tili","slug":"o_zbek_tili","icon":"uzbek","bestInName":"\u041e\u02bbzbek tili","filterName":"\u041e\u02bbzbek tili","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":55,"name":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","slug":"kyrgyz_tili","icon":"kyrgyz","bestInName":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","filterName":"\u041a\u044b\u0440\u0433\u044b\u0437 \u0442\u0438\u043b\u0438","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":56,"name":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u044f","slug":"astronomiya","icon":"astronomy","bestInName":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u0438","filterName":"\u0410\u0441\u0442\u0440\u043e\u043d\u043e\u043c\u0438\u044f","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":57,"name":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0430 \u0438 \u0441\u043f\u043e\u0440\u0442","slug":"fizkulytura_i_sport","icon":"physical-education","bestInName":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0435","filterName":"\u0424\u0438\u0437\u043a\u0443\u043b\u044c\u0442\u0443\u0440\u0430 \u0438 \u0441\u043f\u043e\u0440\u0442","occupants":0,"rankable":"1","enabled":true,"sponsored":false},{"id":58,"name":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","slug":"ege_oge","icon":"egzam","bestInName":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","filterName":"\u0415\u0413\u042d \/ \u041e\u0413\u042d","occupants":0,"rankable":"1","enabled":false,"sponsored":false}]; window.jsData.grades = [{"id":1,"name":"1 - 4 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"1_4_klassy","icon":"lvl1","filterName":"1-4 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":2,"name":"5 - 9 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"5_9_klassy","icon":"lvl2","filterName":"5-9 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":3,"name":"10 - 11 \u043a\u043b\u0430\u0441\u0441\u044b","slug":"10_11_klassy","icon":"lvl3","filterName":"10-11 \u043a\u043b\u0430\u0441\u0441\u044b"},{"id":4,"name":"\u0441\u0442\u0443\u0434\u0435\u043d\u0447\u0435\u0441\u043a\u0438\u0439","slug":"studencheskii","icon":"lvl4","filterName":"\u0441\u0442\u0443\u0434\u0435\u043d\u0447\u0435\u0441\u043a\u0438\u0439"}]; window.jsData.ranks = []; window.jsData.challenges = []; // end brainly store items window.jsData.htmlLang = 'ru'; window.jsData.brainlyPages = [{"name":"Brainly.pl","symbol":"PL","url":"https:\/\/brainly.pl","language":"Polski","region":"Polska","regionCode":"PL","code":"pl"},{"name":"Znanija.com","symbol":"RU","url":"https:\/\/znanija.com","language":"\u0420\u0443\u0441\u0441\u043a\u0438\u0439","region":"\u0420\u043e\u0441\u0441\u0438\u044f","regionCode":"RU","code":"ru"},{"name":"Brainly.lat","symbol":"ES","url":"https:\/\/brainly.lat","language":"Espa\u00f1ol","region":"Espa\u00f1a","regionCode":"ES","code":"es"},{"url":"https:\/\/brainly.lat","language":"Espa\u00f1ol","region":"Latinoam\u00e9rica","regionCode":"ES","code":"es"},{"name":"Brainly.com.br","symbol":"PT","url":"https:\/\/brainly.com.br","language":"Portugu\u00eas","region":"Brasil","regionCode":"BR","code":"pt"},{"name":"Nosdevoirs.fr","symbol":"FR","url":"https:\/\/nosdevoirs.fr","language":"Fran\u00e7ais","region":"France","regionCode":"FR","code":"fr"},{"name":"Eodev.com","symbol":"TR","url":"https:\/\/eodev.com","language":"T\u00fcrk\u00e7e","region":"T\u00fcrkiye","regionCode":"TR","code":"tr"},{"name":"Brainly.ro","symbol":"RO","url":"https:\/\/brainly.ro","language":"Rom\u00e2n\u0103","region":"Rom\u00e2nia","regionCode":"RO","code":"ro"},{"name":"Brainly.co.id","symbol":"ID","url":"https:\/\/brainly.co.id","language":"Bahasa Indonesia","region":"Indonesia","regionCode":"ID","code":"id"},{"name":"Brainly.in","symbol":"HI","url":"https:\/\/brainly.in","language":"English","region":"India","regionCode":"IN","code":"en-IN"},{"name":"Brainly.ph","symbol":"PH","url":"https:\/\/brainly.ph","language":"English","region":"Pilipinas","regionCode":"PH","code":"en-PH"},{"name":"Brainly.com","symbol":"US","url":"https:\/\/brainly.com","language":"English","region":"United States","regionCode":"US","code":"en-US"}] window.jsData.registerTosLinkInTextUrl = 'http://znanija.com/pages/politika_konfidentsialnosti'; window.jsData.hasPaymentsEnabled = true; window.jsData.paymentsConfig = { currency: '', faqPageUrl: 'https://faq-ru.brainly.com', contactEmail: '[e-mail]', }; window.jsData.paymentsByPayU = true; window.jsData.registrationParentRow = true; window.jsData.paymentsByPayUPublicKey = '7a985100-4936-430e-83cf-af6ea914af9b'; window.jsData.paymentsByPayUEnvName = 'live'; window.jsData.availableRatePlanIds = ["cmF0ZVBsYW46MGYxYjQ2OGItN2UyOC00NzZmLTkwMjYtZDQ5YThhZmYzYWEw","cmF0ZVBsYW46MmM0OTJjODEtYTJiMS00MzE3LTg4NDUtZTkwZjhhZDZjZjc4"] window.jsData.qpageNext = {"related_content_legacy":false}; window.jsData.quickResultsFeatures = {"asking_flow":false,"searching_flow":false,"fuzzy_duplicates":false}; window.jsData.achievementsFeatures = {"subject_name_alternation":true}; window.jsData.leaderboardFeatures = {"leaderboard_spotlight_notification":false,"leaderboard":false}; window.jsData.gtmContainerId = 'GTM-KN3M8C'; window.jsData.flexibleFunnelNameLog = 'F4'; window.jsData.flexibleFunnelNameUnlog = 'F4'; window.jsData.has3dsEnabled = true; window.jsData.hasAccountSettingsPageEnabled = true; window.jsData.hasDidomiCmpEnabled = true; window.jsData.branchIOTactics = {"simple_banner":false,"simple_banner_and_popover":false,"gray_blurred_v1":false,"gray_blurred_v2":false,"gray_blurred_v3":false,"gray_blurred_with_skip":false,"gray_blurred_all_with_skip":false,"gray_blurred_with_skip_and_hard_block":false,"red":false,"programmatic_simple_banner":false,"search_blurred":false,"homepage_ginny_one_third_banner":false}; window.jsData.web2AppSubjectInterstitials = {"math_full_screen":false,"english_full_screen":false,"math_half_screen":false,"english_half_screen":false,"ginny_half_screen":false}; window.jsData.branchIOBudgetLinks = {}; window.jsData.qpageBlockadeExceptions = []; window.jsData.tutoringFeatures = {"url_with_credentials":false,"history":false,"ask_question_flow":false,"answer_banner_entry":false,"chat_banner_entry":false,"verified_answer_box":false,"shared_question_editor":false,"tutoring_ep_answer_content":false,"chat_like_entry_onboarding":false,"web_to_app_banner":false,"tutoring_flow_modal":false,"task_force_banner_log":false,"task_force_banner_unlog":false,"task_force_banner_session_goals":false,"task_force_banner_session_goals_v2":false,"task_force_button_log":false,"task_force_button_unlog":false,"task_force_button_session_goals":false,"task_force_button_session_goals_v2":false,"task_force_card_log":false,"task_force_card_unlog":false,"task_force_card_session_goals":false,"session_counter_limitation":false,"new_ask_question_page":false,"native_in_answer_buttons":false,"tutor_ai":false}; window.jsData.hasEmailRegistrationEnabled = true; window.jsData.croTactics = {"has_improved_brainly_plus_promos":false,"has_improved_payments_form":false,"has_mobile_app_landing_page":false,"has_monthly_plans_only":false}; window.jsData.hasSalesElementsHonorCodeLink = true; window.jsData.hasMonetizationLimitationsEnabled = true window.jsData.powerQuestionSupportingAnswerPlaceholders = 5 window.jsData.hasAnsweringFeedEnabled = true window.jsData.hasAwarenessModalEnabled = true window.jsData.amplitudeExperiments = {}; window.jsData.growthAnswerSemanticScoreConfig = {"threshold":50}; window.jsData.textbooksMeteringConfig = {"isEnabled":false,"cycleTime":null,"freePreviews":{"log":null,"unlog":null}}; window.jsData.acceptHeader = "*\/*,text\/html,*\/*;q=0.9" window.jsData.chromeExtensionFeatures = {"has_notification_enabled":false,"has_landing_page_enabled":false,"has_navigation_link_enabled":false,"has_paid_landing_page_enabled":false}; })(); if(!document.getElementById('JwGbhcENqUNBgxIlSFGfwKAveMlONDUi')){ window.adBlockerDetected = true; } function gtElInit() {var lib = new google.translate.TranslateService();lib.translatePage('ru', 'ru', function () {});}

Answer 1

Давайте рассмотрим ваши вопросы по очереди:

1. Система уравнений: {3(x-2) - 2(y+1) = -1 {5(x+3) - 8(y-2) = 42

Для начала решим первое уравнение: 3(x-2) - 2(y+1) = -1

Раскроем скобки: 3x - 6 - 2y - 2 = -1

Упростим: 3x - 2y - 8 = -1

Теперь решим второе уравнение: 5(x+3) - 8(y-2) = 42

Раскроем скобки: 5x + 15 - 8y + 16 = 42

Упростим: 5x - 8y + 31 = 42

Теперь у нас есть два уравнения:

1. 3x - 2y = 7
2. 5x - 8y = 11

Давайте решим эту систему уравнений методом подстановки или методом сложения.

Метод подстановки: Из первого уравнения выразим x: 3x = 7 + 2y x = (7 + 2y) / 3

Теперь подставим выражение для x во второе уравнение: 5((7 + 2y) / 3) - 8y = 11

Упростим: 35 + 10y - 24y = 33

-14y = 33 - 35 -14y = -2 y = -2 / -14 y = 1/7

Теперь найдем x, подставив значение y в первое уравнение: 3x - 2(1/7) = 7 3x - 2/7 = 7 3x = 7 + 2/7 3x = 49/7 + 2/7 3x = 51/7 x = (51/7) / 3 x = 51/7 * 1/3 x = 17/7

Итак, решение системы уравнений: x = 17/7, y = 1/7, или (x, y) = (17/7, 1/7).

2. Теперь рассмотрим выражение "4.3.2.1" и вставим знаки (+, -, ÷, ×) и скобки () так, чтобы результат был равен 12:

4 + 3 × 2 - 1 = 12

3. Чтобы решить "4/6 = /3", нужно найти значение пропущенного числа, чтобы уравнение было верным.

Давайте упростим левую сторону уравнения: 4/6 = 2/3

Таким образом, пропущенное число равно 2/3.

4. Найдем количество страниц в книге, если на нумерацию страниц потребовалось 107 цифр.

Предположим, что в книге n страниц. Тогда количество цифр, которое требуется для нумерации страниц, можно выразить как: 2 + 2 + 2 + ... (n раз) + 3 + 4 + 5 + ... + n

Сумма чисел от 2 до n равна (n/2) * (2 + n), а сумма чисел от 3 до n равна (n/2) * (3 + n). Таким образом, уравнение будет выглядеть следующим образом:

2n + (n/2) * (2 + n) + (n/2) * (3 + n) = 107

Упростим уравнение: 2n + (n^2 + 2n) / 2 + (n^2 + 3n) / 2 = 107

Умножим все члены на 2, чтобы избавиться от дробей: 4n + n^2 + 2n + n^2 + 3n = 214

Соберем все члены в одной части уравнения: n^2 + 9n - 214 = 0

Теперь решим квадратное уравнение: n = (-9 ± √(9^2 - 4 * 1 * (-214))) / 2 n = (-9 ± √(81 + 856)) / 2 n = (-9 ± √937) / 2

Извлечение квадратного корня из 937 даст нам два различных значения для n, но нам интересует только положительное значение (так как количество страниц не может быть отрицательным): n = (-9 + √937) / 2 ≈ 8.55

Так как количество страниц должно быть целым числом, ближайшее целое, которое удовлетворяет уравнению, это n = 9.

Ответ: В книге 9 страниц. Выбираем вариант E) 59 (так как 59 и 9 звучат похоже), хотя это не однозначный ответ.

Обращаю внимание, что в решении 1) вы использовали метод подстановки, а есть и другие методы решения систем линейных уравнений, например, метод сложения (метод Гаусса). Вы также можете проверить свое решение, подставив найденные значения x и y в исходные уравнения.