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0.61*0.25+0.18*1/4+0.21*百分之二十五简便计算
人气:239 ℃ 时间:2020-02-06 00:19:50
解答
0.61×0.25+0.18×1/4+0.21×25%
=0.61×0.25+0.18×0.25+0.21×0.25
=(0.61+0.18+0.21)×0.25
=1×0.25
=0.25
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