а) 2 1/10 ÷ 1 2/5 = 21/10 × 5/12=21/24= 7/8
б) 4 1/2 ÷ 5 1/4 =
5/2×4/21=20/42=10/21
в) 4 3/4÷1/4-2 = 15/4×4/1-2=13
3/14×7=3/2
