Question

(30 х Х - 560) : 8 = 80

630 : (30 - y) - 45 = 25

4 класс.

Answer 1

(30 х Х - 560) : 8 = 80

30х-560=80*8

30х-560=640

30х=640=560

30х=1200

х=1200/30

х=40

 

630 : (30 - y) - 45 = 25

630/(30-у)=25+45

630-(30/у)=70

30-у=630/70

30-у=9

у=30-9

у=21