3/10*( )=5*( )=( )除以1/19=0.25*( )=1

问题描述:

3/10*( )=5*( )=( )除以1/19=0.25*( )=1

3/10*( 10/3)=5*(1/5 )=(1/19 )除以1/19=0.25*(4 )=1

3/10*(10/3 )=5*(1/5 )=(1/19 )除以1/19=0.25*(4 )=1