(1-(4/5))/(5/9)+(13.8-13)/(5/9)+1.8
=(1/5)*9/5+0.8*9/5+9/5
=(1/5+0.8+1)*9/5
=2*9/5
=18/5
(1-(4/5))/(5/9)+(13.8-13)/(5/9) = 1.8 简便计算
(1-(4/5))/(5/9)+(13.8-13)/(5/9) = 1.8 简便计算
数学人气：945 ℃时间：2020-03-25 03:26:27
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