已知x-3y=0,求(2x+y)/(x^2-2x+y^2)*(x-y)的值。
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x-3y=0
x=3y
(2x+y)/(x^2-2xy+y^2)*(x-y)
=(2x+y)/(x-y)²×(x-y)
=(2x+y)/(x-y)
=7y/2y
=7/2
x=3y
(2x+y)/(x^2-2xy+y^2)*(x-y)
=(2x+y)/(x-y)²×(x-y)
=(2x+y)/(x-y)
=7y/2y
=7/2
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(2x+y)/(x^2-2x+y^2)*(x-y)
=(6y+y)/(3y^2-6y+y^2)*(3y-y)
=7y/2y*2y
=7y
=(6y+y)/(3y^2-6y+y^2)*(3y-y)
=7y/2y*2y
=7y
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