25+26+27+28+29+30+31+32+33+34+35简算

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25+26+27+28+29+30+31+32+33+34+35简算25+26+27+28+29+30+31+32+33+34+35简算25+26+27+28+29+30+31+32+33+34+35

25+26+27+28+29+30+31+32+33+34+35简算
25+26+27+28+29+30+31+32+33+34+35简算

25+26+27+28+29+30+31+32+33+34+35简算
等差数列.(25+35)*11/2=330