Ответ:

3/8÷5/7=3/8*7/5=21/40

1/5÷3/4=1/5*4/3=4/15

4/5÷4/7=4/5*7/4=7/5=1 2/5

3/16÷5/12=3/16*12/5=9/20

3/5÷9/25=3/5*25/9=5/3=1 2/3

7/8÷2=7/8*1/2=7/16

3/8÷3=3/8*1/3=1/8

5÷2/5=5*5/2=25/2=12 1/2

8÷4/5=8*5/4=10

3/7÷1/2=3/7*2/1=6/7

Пошаговое объяснение: