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1-1/4+1/20+1/30+1/42+1/56
简便计算哦
人气:295 ℃ 时间:2020-07-07 05:17:24
解答
1-1/4+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8
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