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(12.5+1.25)*0.8用简便方法计算怎么做
人气:350 ℃ 时间:2019-09-29 04:34:29
解答
(12.5+1.25)*0.8
=(12.5+1.25)*4*0.2
=(12.5*4+1.25*4)*0.2
=(50+5)*0.2
=11
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