1)15/16 ÷ 1 1/48 = 15/16 ÷ 49/48 = 15/16 × 48/49 =720/784= 45/49
2)45/49 ÷ 2 1/7 = 45/49 ÷ 15/7 = 45/49 × 7/15 =315/735= 3/7
3)3/7 ÷ 2 2/49 = 3/7 ÷ 100/49 = 3/7 × 49/100 =147/700= 21/100
4)21/100 ÷ 24/125 = 21/100 × 125/24 = 2625/2400= 35/32 = 1 3/32
ответ 1 3/32