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用简便方法计算(-421)x(-1/4)-0.25x(-7又1/2)-28.5x25%
人气:343 ℃ 时间:2020-06-18 11:17:26
解答
=421*1/4+1/4*15/2-28.5*1/4
=1/4*(421+7.5-28.5)
=1/4*(421-21)
=1/4*400
=100
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