Question

Помогите решить уровнение даю 50 балов 1)19,5-0,3х=15,9 2)(7-0,2х)×1,4=7,56 3)(6,1х-13,2)÷1,7=3​

Answer 1

Ответ:

19,5x-0,3x=15,9

-0,3x=15,9-19,5

-0,3x=-3,6

0,3x=3,6

x=3,6/0,3

x=12

(7-0,2x)*1,4=7,56

9,8-0,28x=7,56

-0,28x=7,56-9,8

-0,28x=-2,24

0,28x=2,24

x=2,24/0,28

x=8

Answer 2

$1)19.5 - 0.3x = 15.9 \\ - 0.3x = 15.9 - 19.5 \\ - 0.3x = - 3.6 \\ 0.3x = 3.6 \\ x = 3.6 \div 0.3 \\ x = 12$

$2)(7 - 0.2x) \times 1.4 = 7.56 \\ 9.8 - 0.28x = 7.56 \\ - 0.28x = 7.56 - 9.8 \\ -0.28x = - 2.24 \\ - 0.28x = 2.24 \\ x = 2.24 \div 0.28 \\ x = 8$

$3)(6.1 x - 13.2) \div 1.7 = 3 \\ 6.1x - 13.2 = 3 \times 1.7 \\ 6.1x = 5.1 + 13.2 \\ 6.1x = 18.3 \\ x = 18.3 \div 6.1 \\ x = 3$