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

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

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

(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)