Question

Розв'яжіть систему рівнянь: {x + 1 = 5 (y + 2) {3 (2x-5) -4 (3y - 4) = 19 Смотреть ответ Участник Знаний Участник Знаний Ответ:Способ подстановки:{x+1=5(y+2){3(2x-5)-4(3y-4)=19{x=5y+9{3(2x-5)-4(3y-4)=193(2(5y+9)-5)-4(3y-4)=19y=-2x=5*(-2)+9x=-1(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,-2)Метод исключения переменных:{x+1=5(y+2){3(2x-5)-4(3y-4)=19{x-5y=9{6x-12y=18{x-5y=9{-x+2y=-3-3y=6y=-2x-5*(-2)=9x=-1(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,2)Метод крамера:{x+1=5(y+2){3(2x-5)-4(3y-4)=19{x-5y=9{6x-12y=18D=18D_1=-18D_2=-36D≠0Находим x,y по формулам:x=-1y=-2(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,-2)Метод сравнения:{x+1=5(y+2){3(2x-5)-4(3y-4)=19{x+1=5y+10{3(2x-5)-4(3y-4)=19{x+1=5y+10{6x-15-4(3y-4)=19{x+1=5y+10{6x-15-12y+16=19{x+1-5y=10{6x-15-12y+16=19{x-5y=10-1{6x-15-12y+16=19{x-5y=10-1{6x+1-12y=18{x-5y=9{6x+1-12y=19{x-5y=9{6x-12y=19-1{x=9+5y{6x-12y=19-1{x=9+5y{6x-12y=18{x=9+5y{6x=18+12y{x=9+5y{x=3+2y9+5y=3+2yy=-2x=3+2*(-2)x=-1(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,-2)Обратная матрица:{x-5y=9{3(2x-5)-4(3y-4)=19{x-5y=19{6x-12y=18[1 -5][6 -12]*[x] [y] =[9] [18]A=[1 -5] [6 -12]A^-1=[-2/3 5/18] [-1/3 1/18][x][y]=[-2/3 5/18] [-1/3 1/18]*[9] [18][x][y]=[-1] [-2]x=-1y=-2(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,-2)Метод Гаусса Жордана:{x+1=5(y+2){3(2x-5)-4(3y-4)=19{x-5y=9{3(2x-5)-4(3y-4)=19{x-5y=9{6x-12y=18[1 -5| 9][6 -12| 18][1 -5| 9][1 - 2| 3][1 -5| 9][0 3| - 6][1 - 5| 9][0 1| -2|[1 0| -1][0 1| -2]{x=-1{y=-2(x,y)=(-1,-2){-1+1=5(-2+2){3(2*(-1)-5)-4(3*(-2)-4)=19{0=0{19=19(x,y)=(-1,-2) Новые вопросы в Алгебра 40 баллов !!!Вычислите производную f'(x) при данном значении аргумента х СРОЧНО!! Задание 2 Башни &lt;&lt;Темір жолы», называемые «Голубыми китами», в Нур-Султане посетили две группы туристов. Они одновременно сели на сосед … ние лифты, решив подняться на 27 этаж. Для этого им нужно проехать 120 м. Первый лифт поднялся на нужный этаж на 0,3 мин раньше. Туристы выяснили, что скорость второго лифта на 0,5 м/с меньше скорости первого лифта. Какова скорость каждого из лифтов? еще два вопросика, отдам последнии баллы(( (2a–2b)^2/a–b; (3c+9d)^2/c+3d; (3x+6y)^2/5x+10y; 4x^2–y^2/10x+5y a^8+a^5/a^5+a^2 при a=–1/2; b^10–b^8/b^8–b^6 приb=–0,1 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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Answer 1

Извините, но ваш запрос содержит некорректные математические выражения, и мне трудно понять, что именно вы хотели бы узнать или решить. Пожалуйста, переформулируйте вопрос, предоставив четкие математические выражения, и я постараюсь вам помочь.