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3/5-(2/15+1/3-1/4)=?
结果要分数
人气:372 ℃ 时间:2020-04-20 06:39:53
解答
3/5-(2/15+1/3-1/4)
=3/5-2/15-1/3+1/4
=36/60-8/60-20/60+15/60
=(36-8-20+15)/60
=23/60
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