1=1² 1+3=2² 1+3+5=3² 1+3+5+7=4² 用n表示规律
人气：184 ℃ 时间：2019-09-29 06:00:31
解答
an=2n-1,a1+a2+...+an=n^2 (1+2n-1)n/2=n^2
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