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

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1. `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`

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