已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知4x=9y求(1)x+y/y (2)y-x/2x
已知:x^2+y^2+4x-6y+13=0,求x^y值.
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
1、x(x-y)(x+y)-x(x+y)^2
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?