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3.9×1.4÷0.35的简便算法
人气:404 ℃ 时间:2020-03-10 19:35:14
解答
3.9×1.4÷0.35
=3.9×(2*0.7)÷(0.5*0.7)
=3.9*(2÷0.5)
=3.9*4
=15.6
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