21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40=?
人气：314 ℃ 时间：2019-08-19 10:07:32
解答
=(21+40)+(22+39)+……+(30+31)
=61+61+……+61
=61×10
=610
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