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问题: 5年级分数计算题

计算5/4-9/20+11/30-13/42+15/56-17/72+19/90

解答:

5/4-9/20+11/30-13/42+15/56-17/72+19/90
=(1+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)-(1/8+1/9)+(1/9+1/10 )
=1+1/10
=11/10