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数学
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简便计算256*63-56*71小学四年级
人气:226 ℃ 时间:2020-03-24 00:52:00
解答
256*63-56*71=(200+56)*63-56*71=200*63+56*63-56*71
=200*63+56*(63-71)
=200*63-56*8
=12152
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