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=3(x+y)
x+y分之5(x-y)—2(x-y)分之x+y
=15(x+y)/(x+y)-(x+y)/6(x+y)
=15-1/6
=14又5/6