Question

1894. Розв'яжи рiвняння: a) 5x + 7 = 122 B) 5 : (x + 7) = 0,2 6) 5(x + 7) = 120 г) (x + 7) : 5 = 12​

Answer 1

Ответ:

1.

$5x + 7 = 122 \\ 5x = 122 - 7 \\ 5x = 115 \\ x = 115 \div 5 \\ x = 23$

2.

5:(х+7)=0,2

х+7=5:0,2

х+7=25

х=25-7

х=18

3.

$5(x + 7) = 120 \\ x + 7 = 120 \div 5 \\ x + 7 = 24 \\ x = 24 - 7 \\ x = 17$

4.

$(x + 7) \div 5 = 12 \\ x + 7 = 12 \times 5 \\ x + 7 = 60 \\ x = 60 - 7 \\ x = 53$