Question

хелп ми матем Nomer 7

Answer 1

1) 389+(x-47)=819
x-47=819-389
x-47=430
x=430+47
x=477

2) 900:a=180:4
900:a=45
a=20

3) (x+631)-567=666
x-631= 666+567
x-631= 1233
x= 1233+631
x=1864

4) 47*x=611
x=611:47
x=13