Tính rồi viết đáp số dưới dạng hỗn số

a) 1/2 : 1/3 = (1/2) / (1/3) = (1/2) * (3/1) = 3/2 = 1 1/2
b) 3/5 : 4/7 = (3/5) / (4/7) = (3/5) * (7/4) = 21/20 = 1 1/20
c) 1/3 : 2/7 = (1/3) / (2/7) = (1/3) * (7/2) = 7/6 = 1 1/6
d) 7/9 : 2/1 = (7/9) / (2/1) = (7/9) * (1/2) = 7/18 = 0 7/18
e) 5/6 : 2/11 = (5/6) / (2/11) = (5/6) * (11/2) = 55/12 = 4 7/12
f) 4/7 : 3/13 = (4/7) / (3/13) = (4/7) * (13/3) = 52/21 = 2 10/21