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4.2*2/5乘8/7*0.75
人气:185 ℃ 时间:2020-07-01 09:25:56
解答
4.2x2/5x8/7x0.75
=21/5x2/5x8/7x3/4
=(21/5x8/7)x(2/5x3/4)
=24/5x6/20
=144/100
=1.44
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