Допоможіть будьласка розвязати дроби

Ответ:

1. 3/4÷5/7 = 3/4×7/5 = 21/20 = 1 1/20

2. 5/18÷25/27 = 5/18×27/25 = 135/450 = 3/10

3. 9/16÷3/64 = 9/16×64/3 = 3/1×4/1 = 12/1 = 12

4. 25/72÷40/63 = 25/72×63/40 = 5/8×8/7 = 40/56 = 5/7