ansansans =∑i=114514i1919810=n(n+1)(2n+1)∗6+789\sum\limits_{i=114}^{514} i^{1919810}={n(n+1)(2n+1)}*{6} + {789}i=114∑514i1919810=n(n+1)(2n+1)∗6+789
NNN = ∑i=1m2ai∗m\sum\limits_{i=1}^{{m^{2}}} a_i* mi=1∑m2ai∗m
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