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1+3+5+7+9+11+13+15+17+19+21+23+25+27+29=?
人气:265 ℃ 时间:2019-10-19 12:08:03
解答
225
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1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31.+99
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+……+101
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31
A B C D E F G 1 3 5 7 9 11 23 21 19 17 15 13 25 27 29 31 33 35
1=2,3+5=8,7+9+11=27,13+15+17+19=64,21+23+25+27+29=125 (n^2-n+1)+...+(n^2+n-1)=n^3证明过程
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