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