Verified answer

Пошаговое объяснение:

1) 3/20 + 2/15 = 9/60 + 8/60 = 17/60

2) 17/32 - 5/12 = 51/96 - 40/96 = 11/96

3) 11/28 + 9/14 = 11/28 + 18/28 = 29/28 = 1 1/28

4) 35/36 - 41/45 = 175/180 - 164/180 = 11/180

5) 3 21/25 + 1 2/5 = 3 21/25 + 1 10/25 = 4 31/25 = 5 6/25

6) 4 13/16 - 2 3/8 = 4 13/16 - 2 6/16 = 2 7/16

7) 5 5/6 - 31/48 = 5 40/48 - 31/48 = 5 9/48 = 5 3/16

8) 6 4/7 - 2 37/77 = 6 44/77 - 2 37/77 = 4 7/77 = 4 1/11