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23*97 69怎么简便算
人气:344 ℃ 时间:2020-07-04 16:36:12
解答
23×9769
=23×(10000-231)
=23×10000-23×231
=230000-23×(230+1)
=230000-23×230-23
=230000-23×(23×10)-23
=230000-23×23×10-23
=230000-5290-23
=224687
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