1×2/1+2×3/1+3×4/1+…+98×99/1+99×100/1 用简便方法计算
人气:130 ℃ 时间:2019-08-19 09:46:17
解答
1×2/1+2×3/1+3×4/1+…+98×99/1+99×100/1
=1-2/1+2/1-3/1+3/1-4/1+……+99/1-100/1
=1-100/1
=100/99
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