发布时间:2025-01-19 13:05:39
平方差
a^2-b^2=(a+b)(a-b)
平方和
1+2^2+3^2+...+n^2=Sn
Sn = n*(n+1)*(2n+1)/6
我住的地方要开发成小高层商品房.在开发的商品楼房旁边有多家私人危房,无人居住,也未拆迁。
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