241乘以345除以17除以345乘以17的巧算方法.(脱式计算)
人气:123 ℃ 时间:2019-11-04 14:14:14
解答
241×(345-100)×1/17×1/345×17
=( 241×345-24100)×1/345
=241×345×1/345-24100×1/345
=241-241×100×1/345
=241×(1-100/345)
=241×245/345
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