已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
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![已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值](/uploads/image/z/318775-31-5.jpg?t=%E5%B7%B2%E7%9F%A5x%EF%BC%8D5y%3D0%2C%E6%B1%82%E5%88%86%E5%BC%8Fx%26%23178%3B%EF%BC%8D2xy%2By%26%23178%3B%2F3x%2By+%C3%97+%EF%BC%88y%EF%BC%8Dx%EF%BC%89%E7%9A%84%E5%80%BC)
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
x-5y=0
x=5y
原式=( x-y)平方/(3x+y)(y-x)
=(5y-y)平方/(15y+y)(y-5y)
=16y平方/-64y平方
=-1/4
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