6 10 17 11 --- --- --- --- 23 —21 + 23 ---21

问题描述:

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请问你是数学老师吗?这否在讲解一下?