Ответ:

Пошаговое объяснение:

1) 14/15 : 7/10 = 14/15*10/7=6/2=3

14/15 : 21 = 14/15:21/1=14/15*1/21=2/45

14/15 : 1 5/7 = 14/15:1 5/7=14/15:12/7=14/15*7/12=49/90

14/15 : 2/7 = 14/15*7/2=49/15= 3 4/15

2) 7/10 : 3/8 = 7/10*8/3=28/15=1 13/15

21 : 3/8 = 21/1*8/3=7*8=56

1 5/7 : 3/8 = 12/7*8/3=32/7=4 4/7

2/7 : 3/8 = 2/7*8/3=16/21