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数学
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1/50*51+1/51*52+.+1/99*100
人气:123 ℃ 时间:2019-09-19 03:29:02
解答
1/50*51+1/51*52+.+1/99*100
=(1/50-1/51)+(1/511-1/52)+.+(1/99-1/100)
=1/50-1/100
=1/100
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