Question

Задание: «Найдите ошибку и реши верно»

1. 7(2 + х ) – 3х = 5х – 6

14+7х3х=5х-6

7х-5х+3х=-14-6

5х=-20

Х=-20:5

Х=-4

2. 4х – 2(3 + х ) = 9 – х

4х-6-2х=9-х

4х+2х+х=9+6

7х=15

Х=15:7

Х=2

3. 4 – ( 2х + 3) = 5х – 6

4-2х+3=5х-6

-2х-5х=4+3-6

-7х=1

Х=1: (-7)

Х=-

4. 7+ ( 5х – 8) = 7х + 9

7 + 5х - 8=7х+9

5х+7х=7-8+9

12х=8

х=8:12

х=

Answer 1

Ответ:

Объяснение:

1) 7(2 + х ) – 3х = 5х – 6

14 + 7х - 3х = 5х - 6

7х - 5х - 3х = -14 - 6

-х = -20

х = 20

2) 4х – 2(3 + х ) = 9 – х

4х - 6 - 2х = 9 - х

4х - 2х + х = 9 + 6

3х = 15

х = 15 : 3

х = 5

3) 4 – (2х + 3) = 5х – 6

4 - 2х - 3 = 5х - 6

-2х - 5х = -4 + 3 - 6

-7х = -7

х = -7 : (-7)

х = 1

4) 7+ (5х – 8) = 7х + 9

7 + 5х - 8 = 7х + 9

5х - 7х = -7 + 8 + 9

-2х = 10

х = 10 : (-2)

х= -5