已知x^2-5XY+4y^2=0求分式x-y/x+y的值⊙﹏⊙b汗.
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已知x^2-5XY+4y^2=0求分式x-y/x+y的值⊙﹏⊙b汗.
已知x^2-5XY+4y^2=0求分式x-y/x+y的值⊙﹏⊙b汗.
已知x^2-5XY+4y^2=0求分式x-y/x+y的值⊙﹏⊙b汗.
x²-5xy+4y²=0
(x-4y)(x-y)=0
即:x-4y=0得:x=4y或者:x-y=0得:x=y
则:(x-y)(x+y)
1、若x=y,则这个值是0
2、若x=4y,则=(4y-y)/(4y+y)=3/5
(x-2y)^2=0 => x=2y => (2x-y)/(2x+y) =(4y-y)/(4y+y) =3/5