1) - 7(2-3x) =56;2)x-8/x+2=7/3;3)-9(6x+1)=-45(2x+2,6).ПОЖАЛУЙСТА
Ответ:
Пошаговое объяснение:
1) -7(2 - 3x) = 56
-14 + 21x = 56
21x = 56 + 14
21x = 70
x = 70 / 21 = 10 / 3
x = 3 1/3
2) x - 8 / x + 2 = 7 / 3
3(x - 8) = 7(x + 2)
3x - 24 = 7x + 14
3x - 7x = 14 + 24
-4x = 38
x = 38 / -4 = - 19 / 2
x = -9 1/2
3) -9(6x + 1) = -45(2x + 2,6)
-54x - 9 = -90x - 117
-54x + 90x = -117 + 9
36x = -108
x = -108 / 36
x = -3