(1/7)*() =(1/9)*()=(1/3)/()=(2/5)+()=()-(1/4)

问题描述:

(1/7)*() =(1/9)*()=(1/3)/()=(2/5)+()=()-(1/4)

7,9,1/3,3/5,5/4
只要你确定一个值带入就行(我是1)