решите уравнения плиз (с решением)1)2(х 2) 1 = 5(х

Ответ:

Пошаговое изъясненье:

1)

2(х 2) 1 = 5(х 2) 7;

2x - 4 - 1 = 5x - 10 - 7

2x - 5 = 5x - 17

5x - 2x = 17 - 5

3x = 12

x = 12 : 3

x = 4

2)

4(2х 6) = 4х 4;

8x - 24 = 4x - 4

8x - 4x = -4 + 24

4x = 20

x = 20 : 4

x = 5

3)

9у + 3 = 3(8у + 45);

-9y + 3 = 24y + 135

24y + 9y = 3 - 135

33y = -132

y = -132 : 33

y = -4

4)

0 + 5х = 44 + х;

5x - x = 44

4x = 44

x = 44 : 4

x = 11

5)

27 4у = 3 8у;

-4y + 8y = 3 - 27

4y = -24

y = -24 : 4

y = -6

6)

5х + 11 = 7х 3;

7x - 5x = 11 + 3

2x = 14

x = 14 : 2

x = 7

7)

8у + 11 = 4у 1.

8y - 4y = -1 - 11

4y = -12

y = -12 : 4

y = -3