12(x-y)-4-9(x-y)^2

4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解, 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 4-12(x-y)+9(x+y)^2 已知4x=9y求(1)x+y/y (2)y-x/2x 分解因式:9(x-y)*2+12(x*2-y*2)+4(x+y)*2 x^2-y^2/x+y-4x(x-y)+y^2/2x-y, (2x-y)^2-4(x-y)(x+2y) (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) 9y=3x-(x-1),4(x+y)-(2x+4)=8y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值