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3.95减2.5乘1.3怎样简便
人气:275 ℃ 时间:2020-04-11 02:08:27
解答
3.95-2.5*1.3
=0.79*5-0.5*5*1.3
=5*(0.79-0.5*1.3)
=5*0.14
=0.7
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