若x^2-2x+y^2-4y+5=0,求9x^2y^2-12x^3y^2+4x^4y^2的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-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*
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
已知4x=9y求(1)x+y/y (2)y-x/2x
已知4x-2y=0,求x-y/3x+2y的值
x平方+y平方-2x-4y+5=0求x,y的值.
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
若2x-3y=0,求5x+4y/3x-2y