1=1 3+5=8 7+9+11=27 13+15+17+19=64的结论是什么
人气:120 ℃ 时间:2019-08-20 21:03:41
解答
n(n-1)+1开始的n个奇数之和为n的三次 n(n-1)+1+ n(n-1)+3 +……+ n(n-1)+2n-1 =n(n-1)n+(1+3+……+2n-1) =n^3-n^2+n^2 =n^3
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