若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值

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若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值若x-y分之x+y=3,求式子x+y分之

若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值

若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
(x-y)分之(x+y)=3
(x+y)分之5(x-y)—2(x-y)分之(x+y)
=5*(x+y)分之(x-y) -2*3
=5/(x-y)分之(x+y)-6
= 5/3 -6
= -13/3