Question

839. Решите уравнения: 1) 3х - 15 = х + 3; 2) 7 - 3x = x + 11; 3) 2(x+3) = x+ 13; 4) 4(5 - x) = 3x - 1; 5) 3(х - 2) = х + 4; 6) 5(x - 1) = 4x + 3. - СРОЧНООООО ​

Answer 1

Ответ:

1)18

2)-3х-х=11-7

- 4х=4

Х=-1

3)2х+6=х+13

Х=7

4)20 - 4х=3х-1

Х=3

5) 3х - 6=х+4

Х =5

6)5х-5=4х+3

Х=8

Answer 2

Решение уравнений:

1) 3x - 15 = x + 3 2) 7 - 3x = x + 11 3) 2(x + 3) = x + 13 4) 4(5 - x) = 3x - 1 5) 3(x - 2) = x + 4 6) 5(x - 1) = 4x + 3

Решение:

1) 3x - 15 = x + 3 2x = 18 x = 9

2) 7 - 3x = x + 11 7 - 11 = 3x + x -4 = 4x x = -1

3) 2(x + 3) = x + 13 2x + 6 = x + 13 x = 7

4) 4(5 - x) = 3x - 1 20 - 4x = 3x - 1 21 = 7x x = 3

5) 3(x - 2) = x + 4 3x - 6 = x + 4 2x = 10 x = 5

6) 5(x - 1) = 4x + 3 5x - 5 = 4x + 3 x = 8

Таким образом, решения уравнений: 1) x = 9 2) x = -1 3) x = 7 4) x = 3 5) x = 5 6) x = 8