Question

6•x+2•x+30=70
5•x+10+10•x=100
630:(3x-21)-47=23
(8y-65):7+39=64​

Answer 1

Ответ:

Пошаговое объяснение:

6 . x + 2 . x + 30 = 70

6х + 2х + 30 = 70

8х = 70 - 30

8х = 40

х = 5

5 . x + 10 + 10 . x = 100

5х + 10 + 10х = 100

15х = 100 - 10

15х = 90

х = 6

630 : (3x - 21) - 47 = 23

630 : (3x - 21) = 23 + 47

630 : (3x - 21) = 70

3х - 21 = 630 : 70

3х - 21 = 9

3х = 9 + 21

3х = 30

х = 10

(8y - 65) : 7 + 39 = 64​

(8y - 65) : 7 = 64 - 39

(8y - 65) : 7 = 25

8y - 65 = 25 . 7

8у - 65 = 175

8у = 175 + 65

8у = 240

у = 30