计算1+3+5+7+9+11+13+15+17+19．
人气：283 ℃ 时间：2019-09-22 06:41:04
解答
1+3+5+7+9+11+13+15+17+19
=（1+19）+（3+17）+（5+15）+（7+13）+（9+11）
=20×5
=100．
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