1-5/6+7/12-9/20+11/30-13/42+15/56
=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8
=1+1/8
=9/8
小学数学题解答1-5/6+7/12-9/20+11/30-13/42+15/56
小学数学题解答1-5/6+7/12-9/20+11/30-13/42+15/56
数学人气：415 ℃时间：2019-08-20 11:08:02
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