0.4*0.25/0.4*0.75 简便运算
人气:242 ℃ 时间:2020-03-29 09:55:22
解答
分子:0.4*0.25
分母:0.4*0.75=0.4*0.25*3
直接约分,
0.4*0.25/0.4*0.75
=0.4*0.25/0.4*0.25 *3
=1/3
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