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3/4*40%+0.75*3/5简便计算
人气：391 ℃　时间：2020-06-13 08:27:51
解答
3/4*40%+0.75*3/5
=0.75x2/5+0.75x3/5
=0.75x(2/5+3/5)
=0.75x1
=0.75
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