tính : (hỗn số) a) 1 1/3 + 2 1/2 b) 3 2/5 – 1 1/10 c)3 1/2 x 1 1/7 d) 4 1/6 : 2 1/3

`1 1/3 + 2 1/2 = (1 + 2) + (1/3 + 1/2) = 3 + 5/6 = 3 5/6`

`3 2/5 – 1 1/10 = (3 – 1) + (2/5 – 1/10) = 2 + 3/10 = 2 3/10`

`3 1/2 × 1 1/7 = 7/2 × 8/7 = 4`

`4 1/6 : 2 1/3 = 25/6 : 7/3 = 25/6 × 3/7 = 25/14`