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10×11×12×13+11=?的简便算法!
人气:481 ℃ 时间:2020-02-04 08:18:31
解答
(11-1)*11(11+1)*13+11 =(121-1)*11*13+11 =120*13*11+11 =120*(12-1)(12+1)+11 =120*(144-1)+11 =120*143+11 =17160+11 =17171
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