2.5*1.25*6.4巧算
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2.5*1.25*6.4巧算2.5*1.25*6.4巧算2.5*1.25*6.4巧算将6.4拆成8乘以0.8,则1.25乘8得10,2.5*0.8得22.5*1.25*6.4=10/4*10/8*8*
2.5*1.25*6.4巧算
2.5*1.25*6.4巧算
2.5*1.25*6.4巧算
将6.4拆成8乘以0.8,则1.25乘8得10,2.5*0.8得2
2.5*1.25*6.4
=10/4*10/8*8*8/10
=80/4
=20
=2.5*2.5*0.5*4*4*0.4=(2.5*4)*(2.5*4)*(0.5*0.4)=10*10*0.2=20
2.5*1.25*6.4
=2.5*1.25*(4*8*0.2)
=2.5*4*1.25*8*0.2
=10*10*0.2
=20
2.5*1.25*6.4
=2.5*4*1.25*8*0.2
=10*10*0.2
=20
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