Question

2/7 / 8 + 5 / 0,7 - 3/4 /21

 Срочно!!!!!!!!!!!!!!!!

Answer 1

2/7:8=1/28

5/0,7=7/2=3 1/2

3/4:21=1/28

1/28+3 1/2-1/28=3 1/2=3,5