4/5后面的是分母吧?用简便方法 我就不明白怎么简便 给列式看看55555
15*5/6-3/4
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2/9*3/20*9
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2/5*4+2/5
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1/2*1/15+1/3*1/2
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1/3*5/12*1/3*1/4
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參考答案:(1)=75/6-3/4
=150/12-9/12
=141/12
(2)=2*3/20
=3/10
(3)=2/5*(4+1)
=2/5*5
=2
(4)=1/2*(1/15+1/3)
=1/2*6/15
=1/5
(5)=1/3*5/3*1/4*1/3*1/4
=5/27*1/4*1/4
=5/432
最后一个跟第一个没什么 简单的啊 这是什么题啊 难道非要简单的么？
这位同学呀！！！！郁闷ing~~~~~~~