约分:[(x^2+y^2-9)^2-4x^2y^2]/(x^2-y^2+6x+9)
约分下列分式(x-y)/(y-x)³(x²-9)/(6-2x)(x²-1)/(x-x
约分:[(x^2+y^2-9)^2-4x^2y^2]/(x^2-y^2+6x+9)
约分:x²+y²-9-2xy/x²-y²+6x+9
分式x^2-y^2/(x-y)^2如何约分
分式约分:(y+z-x)/{x^2-(y+z)^2}
约分6x的平方y/2y的平方
12(x+y)平方/20(x+y)(x+2y)约分
1、x(x-y)(x+y)-x(x+y)^2
已知4x=9y求(1)x+y/y (2)y-x/2x
把分式xy-y/x-2x+1约分
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)