Question

1) 2.7(х-4.7)=9.45
2) (4.7+х):3.8=10.5
3) 2.4+(х:3-5)=0.8
4) 2.45:(2х-1.4)=3.5

Answer 1

Ответ:

Решение уравнения 2.7(х-4.7) = 9.45:

2.7(х-4.7) = 9.45

2.7х - 2.7 * 4.7 = 9.45

2.7х - 12.69 = 9.45

2.7х = 9.45 + 12.69

2.7х = 22.14

х = 22.14 / 2.7

х = 8.2

Решение уравнения (4.7+х)/3.8 = 10.5:

(4.7+х)/3.8 = 10.5

4.7+х = 10.5 * 3.8

4.7+х = 39.9

х = 39.9 - 4.7

х = 35.2

Решение уравнения 2.4+(х/3-5) = 0.8:

2.4 + (х/3 - 5) = 0.8

х/3 - 5 = 0.8 - 2.4

х/3 - 5 = -1.6

х/3 = -1.6 + 5

х/3 = 3.4

х = 3.4 * 3

Решение уравнения 2.45/(2х-1.4) = 3.5:

2.45/(2х-1.4) = 3.5

2.45 = 3.5(2х-1.4)

2.45 = 7х - 4.9

7х = 2.45 + 4.9

7х = 7.35

х = 7.35/7

х = 1.05

х = 10.2