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56×14/19 用简便算法怎么计算
人气:183 ℃ 时间:2020-03-25 11:53:35
解答
56×14/19
=(57-1)×14/19
=57×14/19 -1×14/19
=3×14-14/19
=42-14/19
=41+15/19
= 41又15/19
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