A×3/7=B×3/4,A,B均不为0,那么A:B=(7):(4)A×3/7=B×3/4A/B=(3/4)/(3/7)=(3/4)*(7/3)=7/4
A×3/7=B×3/4,A,B均不为0,那么A:B=(7):(4)(3/4)/(3/7)=7/4
A×3/7=B×3/4,A,B均不为0,那么A:B=():()A×3/7做外项: A:□=□:3/7B×3/4做内项: A:B=3/4:3/7=7:4
A:B=3/4:3/7=7:4