已知x²-1/4y=0,化简2x²+y/4x²+y
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x²+4x+y²-2y+5=0,则x+y=
已知x²+y²-2x+4y+5=0,求x+y
已知x²-1/4y=0,化简2x²+y/4x²+y
已知x²+4x+y-2y+5=0求x+2y
化简:(2x-y)²-4(x-y)(x+y)
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)