Question

решите все задачи пж​

Answer 1

Ответ

12 - 7х = 20 + х

-7х - х = 20 - 12

-8х = 8

х = -1

2х = 7х - 30

2х - 7х = - 30

-5х = -30

х = -30 : -5

х = 6

4х + 5 = 19 - 3х

4х + 3х = 19 - 5

7х = 14

х = 2

26 + 2х = 20 - х

2х + х = 20 - 26

3х = -6

х = -6 : 3

х = -2

х + 7 = х - 7 (утверждение ложно)

3м - м + 5м = 21

7м = 21

м = 21 : 7

м = 3

-z = -5z

-z + 5z= 0

4z = 0

z = 4 * 0

z = 0

0.4(6x - 7) = 0.5(3x + 7)

2.4x - 2.8 = 1.5x + 3.5

2.4x - 1.5x = 3.5 + 2.8

0.9x = 6.3

x = 6.3 : 0.9

x = 7

Незачто)