已知4x^2+y^2-4x+4y+5=0,求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x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知x²+4x+y-2y+5=0求x+2y
已知x²+y²-2x+4y+5=0,求x+y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
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