若x^2+9y^2-2x+12y+5=0,求x+y^2
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若2x-3y=0,求5x+4y/3x-2y
若x^2+9y^2-2x+12y+5=0,求x+y^2
若4x^2-4x+9y^2-12y+5=0求6x+2/3y
已知4x=9y求(1)x+y/y (2)y-x/2x
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?