4/5: 8
3/7: 12
21/22: 7/18
44/45: 11/18
1-целая 13/15: 1-целая 3/5

4/5 ÷ 8 = 5×8/4= 10

3/7 ÷ 12= 7×12/3=28

21/22 ÷ 7/18 = 2 5/11

44/45 ÷ 11/18= 1 3/5

Пошаговое объяснение:

21/22 ÷ 7/18 = 21×18/22×7= 3×18/22=2 10/22 = 2 5/11

44/45 ÷ 11/18= 44×18/45×11= 4×2/5= 1 3/5