Question

Плиз!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

x=900/3+640
x=300+640
x=940

Answer 2

1)
x-640=900:3
x=900:3=300
x=640+300=940
Ответ:x=940
2)
x:9=240:8
x=240:8=30
x=30×9=270
Ответ: x=270