Question

1)2x=18-x
2)-7x+5=30-2x
3)7-2x=3x-18
4)0,2x+2,7=1,4-1,1x
5)3(x-2)=x+2
6) на фото
помогите пж​

Answer 1

Ответ:
1)2х = 18 - х

2х + x = 18

3x = 18

x = 18 : 3

x = 6

2)7 * x + 3 = 30 - 2 * x;

7 * x + 2 * x = 30 - 3;

9 * x = 27;

x = 27/9;

x = 3.

3) 7 - 2x = 3x - 18

- 2x - 3x = -18 - 7

-5x = -25

5x = 25

x = 5

4)0,2 + 2,7 = 1,4 - 1,1 * x; 

2.9 = 1.4 - 1.1 * x;

1.1 * x = 1.4 - 2.9;

11 * x = -15;

x = -15/11.


5) 3(x - 2) = x + 2

3x - 6 = x + 2

3x - x = 2 + 6

2x = 8

x = 4

6)2 2/5 х + 3 2/15 = 3 1/5 х + 2 1/3

3 2/15 - 2 1/3=3 1/5 х - 2 2/5 х

3 2/15 - 2 5/15=4/5 х

12/15=4/5 х

4/5 х=4/5

Х=1