神马作文网已知x-3y=0,求[（2x+6)/(x^2-2xy+y^2)]*(x-y)的值.
![已知x-3y=0,求[（2x+6)/(x^2-2xy+y^2)]*(x-y)的值.](/uploads/image/z/5053763-11-3.jpg?t=%E5%B7%B2%E7%9F%A5x-3y%3D0%2C%E6%B1%82%5B%EF%BC%882x%2B6%29%2F%28x%5E2-2xy%2By%5E2%29%5D%2A%28x-y%29%E7%9A%84%E5%80%BC.)
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