2x^2+9y^2+8x+12y+12=0,2x-3y-?

12y(x-y)^2-8(x-y)^3=? 9(x-y)-12(y-x)^2 求x ,y 9x^2+4y^2-12x-8y+8=0 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=? 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 (X,Y) f(x,y)={12y^2,0 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 9(x-y)^2-12(x-y)+4=快 因式分解：4+12(x+y)+9(x-y)^2=? 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 8（x-y)=3（x+y)-12 6（x+y)=4（2x-y)+16 8（x-y)=3（x+y)-12 6（x+y)=4（2x-y)+16 x-2y=9 x+y+z=7 2x-3y=12 (x-y)^2+12(x-y)+36 4-12(x-y)+9(x-y)² =(2-3x+3y)²