55*56分之55=?

问题描述:

55*56分之55=?

55*55/56
=55*(56-1)/56
=55*(1-1/56)
=55-55/56
=54又56分之1

55*56分之55
=(56-1)*56分之55
=55-56分之55
=54又56分之1

55*56分之55
=(56-1)×55/56
=56×55/56-55/56
=55-55/56
=54又1/56