Question

(3x+5x)*18=144

(7y-3y):8=17

 

Answer 1

(3x+5x)*18=144

3х+5х=144:18

8х=8

х=8:8

х=1

(3*1+5*1)*18=144

 

(7y-3y):8=17

7у-3у=17*8

4у=136

у=136:4

у=34

(7*34-3*34):8=17

Answer 2

(3x+5x)*18=144

8х*18=144

8х=144:18

8х=8

х=8:8

х=1

Проверка: (3*1+5*1)*18=8*18=144

 

(7y-3y):8=17

4у:8=17

4у=8*17

4у=136

у=136:4

у=34

Проверка: (7*34-3*34):8=(238-102):8=136:8=17