5分之8×【4分之3-(12分之7-4分之1)】 用简便方法计算.
人气:278 ℃ 时间:2019-12-13 06:25:48
解答
8/5×[3/4-(7/12-1/4)]
=8/5×[3/4-7/12+1/4]
=8/5×[3/4+1/4-7/12]
=8/5×[1-7/12]
=8/5×5/12
=2/3
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