(+2又31/8)*(-1又7/2)*(+2又15/1)*(-4又2/1)简便算法
(+2又8/31)*(-1又2/7)*(+2有1/15)*(-4又1/2)的简便算法
人气:226 ℃ 时间:2020-05-19 09:03:48
解答
=(31/70*15/31)*(7/9*4/9)
=3/14*28/81
=2/27
=13又2/1不好意思 打反了看不懂了采纳我,重新问写清楚分子分母
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