Question

Решите уравнения :           / - это черта дроби только когда будет делить пишите :   ок ?  7/9x + 4 = 2/3x +8   ;    1/2x + 1/6x = x-3    ;       5.1- 8x = 3.3 - 10x    ;       0.7 * (2-3y) = -7

Answer 1

7/9х + 4 = 2/3х + 8

7/9х - 2/3х = 8 - 4

7/9х - 2/3х = 7/9х - 6/9х = 1/9х          1/9х = 4    х = 4 : 1/9     х = 4 * 9 : 1      х = 36

 

1/2х + 1/6х = х - 3

1/2х + 1/6х - х =  -3

1/2х + 1/6х = 3/6х + 1/6х = 4/6х = 2/3х

2/3х - 1х = 2/3х - 3/3х = - 1/3х

-1/3х = -3

х = -3 : -1/3     х = 3 * 3 : 1      х = 9

 

5.1 - 8х = 3.3 - 10х

-8х + 10х = 3.3 - 5.1

2х =  - 1.8

х = - 1.8 : 2       х = -0.9

 

0.7 * ( 2 - 3у) = -7

2 - 3у = - 7 : 0.7

2 - 3у = - 10

-3у = -10 - 2          -3у = - 12         у = 4