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Сколько решений имеет система1) {y=3x{x+y=42){x-2y=0{2x+y=-5Помоги плиз!!!!!!! Смотреть ответ 2407Alexa 2407Alexa Данные системы можно решить 3-способами: 1) подстановки 2) сложением (вычитанием) 3) графически решу только 2 способом 1) {y=3x {x+y=4 {3x-y=0 {х+у=4 3х-у+х+у=0+4 4х=4|:4 х=1 у=3х=3×1 у=3 Ответ: х=1; у=3 2) {x-2y=0|×2 {2x+y=-5 {2x-4y=0 {2x+y=-5 2x+y-2x-(-4y)=-5-0 y+4y=-5 5y=-5|:5 y=-1 x-2y=0 x=2y x=2×(-1) x=-2 Ответ: х=-2; у=-1. Новые вопросы в Математика найдите 25% от 2ч; 10м30см; 14т85кг Балалар езара алма белісті. Егер олар 7 алмадан алып жатса, онда сонны балада 2 алма, егер 6 алмадан алса, онда 14 алма калады. Канта бала жане канша … алма бар? Пожалуйста помогите! Даю 20 балов!! ТЕРМІНОВО БУДЬ ЛАСОЧКАРозвʼяжи рівняння х+х:2+1=100 Дано прямокутний трикутник ABC з катетами AB та BC та гіпотенузою AC. На сторонах трикутника у зовнішній бік будуються квадрати, і нехай K, L, M – точ … ки перетину діагоналей (центри) квадратів зі сторонами AB, BC, AC відповідно. На прикладі трикутника, зображеного на малюнку, доведіть, що CK = LM. 7 клас! два велосипедисти одночасно виїхали назустріч один одному, і вперше відстань між ними дорівнювала 0,1 всього шляху, коли перший велосипедист проїхав 0 … ,4 всього шляху. Яку частину всього шляху проїде другий велосипедист, коли вдруге відстань між велосипедистами дорівнюватиме 0,1 всього шляху? з докладним поясненням, 7 клас Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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\u043f\u0440\u044f\u043c\u043e\u043a\u0443\u0442\u043d\u0438\u0439 \u0442\u0440\u0438\u043a\u0443\u0442\u043d\u0438\u043a ABC \u0437 \u043a\u0430\u0442\u0435\u0442\u0430\u043c\u0438 AB \u0442\u0430 BC \u0442\u0430 \u0433\u0456\u043f\u043e\u0442\u0435\u043d\u0443\u0437\u043e\u044e AC. \u041d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0430\u0445 \u0442\u0440\u0438\u043a\u0443\u0442\u043d\u0438\u043a\u0430 \u0443 \u0437\u043e\u0432\u043d\u0456\u0448\u043d\u0456\u0439 \u0431\u0456\u043a \u0431\u0443\u0434\u0443\u044e\u0442\u044c\u0441\u044f \u043a\u0432\u0430\u0434\u0440\u0430\u0442\u0438, \u0456 \u043d\u0435\u0445\u0430\u0439 K, L, M \u2013 \u0442\u043e\u0447\u043a\u0438 \u043f\u0435\u0440\u0435\u0442\u0438\u043d\u0443 \u0434\u0456\u0430\u0433\u043e\u043d\u0430\u043b\u0435\u0439 (\u0446\u0435\u043d\u0442\u0440\u0438) \u043a\u0432\u0430\u0434\u0440\u0430\u0442\u0456\u0432 \u0437\u0456 \u0441\u0442\u043e\u0440\u043e\u043d\u0430\u043c\u0438 AB, BC, AC 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Answer 1

Для начала рассмотрим систему уравнений:

1. { y = 3x
2. { x + y = 4
3. { 3x - y = 0
4. { x + y = 4

Мы уже видим, что уравнения (1) и (3) совпадают, так что их можно объединить. Также уравнения (2) и (4) совпадают. Теперь система выглядит так:

1. { y = 3x
2. { x + y = 4

Для решения методом сложения (вычитания) выразим y из уравнения (1) и подставим в уравнение (2):

1. y = 3x
2. x + 3x = 4
3. 4x = 4
4. x = 1

Теперь найдем y, подставив x в уравнение (1): y = 3 * 1 y = 3

Таким образом, решение системы уравнений: x = 1, y = 3.

Теперь перейдем к следующему вопросу.

1. Найдем 25% от 2 часов: 25% от 2 часов = (25/100) * 2 часа = 0.25 * 2 часа = 0.5 часа.

2. Найдем 25% от 10 метров 30 сантиметров: Приведем длину к одной единице измерения, например, в сантиметры: 10 метров = 1000 сантиметров (1 метр = 100 сантиметров). Теперь добавим 30 сантиметров: 1000 сантиметров + 30 сантиметров = 1030 сантиметров.

Теперь найдем 25% от 1030 сантиметров: 25% от 1030 сантиметров = (25/100) * 1030 сантиметров = 0.25 * 1030 сантиметров = 257.5 сантиметров.

3. Найдем 25% от 14 тонн 85 килограммов: Приведем массу к одной единице измерения, например, в килограммы: 14 тонн = 14 * 1000 килограммов (1 тонна = 1000 килограммов). Теперь добавим 85 килограммов: 14 * 1000 килограммов + 85 килограммов = 14000 килограммов + 85 килограммов = 14185 килограммов.

Теперь найдем 25% от 14185 килограммов: 25% от 14185 килограммов = (25/100) * 14185 килограммов = 0.25 * 14185 килограммов = 3546.25 килограммов.

Ответы:

1. 25% от 2 часов = 0.5 часа.
2. 25% от 10 метров 30 сантиметров = 257.5 сантиметров.
3. 25% от 14 тонн 85 килограммов = 3546.25 килограммов.

Теперь перейдем к следующему вопросу.

Для решения уравнения х + х:2 + 1 = 100, выполним следующие шаги:

1. Избавимся от деления во втором слагаемом, умножив обе части уравнения на 2: 2 * (х + х:2 + 1) = 2 * 100 2х + х + 2 = 200

2. Объединим переменные х: 3х + 2 = 200

3. Вычтем 2 из обеих частей уравнения: 3х = 200 - 2 3х = 198

4. Разделим обе части уравнения на 3, чтобы выразить х: х = 198 / 3 х = 66

Таким образом, решением уравнения х + х:2 + 1 = 100 является х = 66.