6/7乘以( )=3/5乘以( )=9乘以( )=0.2乘以( )=1

问题描述:

6/7乘以( )=3/5乘以( )=9乘以( )=0.2乘以( )=1

6/7x(7/6)=3/5x(5/3)=9x(1/9)=0.2x(5)=1