Question

5. Найдите корни уравнений: a) 9(x-1) = x +15; = в) 12 - 4(x - 3) = 39 - 9x; - 16. Решите урави TIG: б) (11x + 14) – (5x - 8) = 25; - r) 2(3x + 5)-3(4x - 1) = 121.​

Answer 1

Пошаговое объяснение:

а)

9(х - 1) = х + 15

9х - 9 = х + 15

9х - х = 15 + 9

8х = 24

х = 24 : 8

х = 3

в)

12 - 4(х - 3) = 39 - 9х

12 - 4х + 12 = 39 - 9х

-4х + 24 = 39 - 9х

-4х + 5х = 39 - 24

х = 15

б)

(11х + 14) - (5х - 8) = 25

11х + 14 - 5х + 8 = 25

6х + 22 = 25

6х = 25 - 22

6х = 3

х = 3 : 6

х = 0,5

г)

2(3х + 5) - 3(4х - 1) = 121

6х + 10 - 12х + 3 = 121

-6х + 13 = 121

-6х = 121 - 13

-6х = 108

х = 108 : (-6)

х = -18