用简便方法计算下面的题目
2/1+6/1+12/1+20/1+````+9900/1
人气:196 ℃ 时间:2020-02-03 03:42:28
解答
2/1+6/1+12/1+20/1+````+9900/1
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/99-1/100
=1-1/100
=99/100
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