0.8*(2.5+1.25)*0.4
=0.8*(2.5*0.4+1.25*0.4)
=0.8*(1+0.5)
=0.8+0.4
=1.2
或者
0.8*(2.5+1.25)*0.4
=0.8*(2.5*0.4)+(0.8*1.25)*0.4
=0.8+0.4
=1.2
0.8*(2.5+1.25)*0.4怎么巧算
1个回答
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