6 10 17 11 --- --- --- --- 23 —21 + 23 ---21急,五年级分数加减法,

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6 10 17 11 --- --- --- --- 23 —21 + 23 ---21急,五年级分数加减法,
6 10 17 11 --- --- --- --- 23 —21 + 23 ---21
急,五年级分数加减法,

6 10 17 11 --- --- --- --- 23 —21 + 23 ---21急,五年级分数加减法,
6/23-10/21+17/23-11/21
=(6/23+17/23)-(10/21+11/21)
=1-1
=0