9(x-y)-12(y-x)^2
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9(x-y)-12(y-x)^29(x-y)-12(y-x)^29(x-y)-12(y-x)^29(x-y)-12(y-x)^2=9(x-y)-12(x-y)^2=-3(x-y)[4(x-y)-3]=
9(x-y)-12(y-x)^2
9(x-y)-12(y-x)^2
9(x-y)-12(y-x)^2
9(x-y)-12(y-x)^2
=9(x-y)-12(x-y)^2
=-3(x-y)[4(x-y)-3]
=-3(x-y)(4x-4y-3)
原式=3（x-y）（3-4（x-y））=3(x-y)(3-4x+4y)
9(x-y)-12(y-x)^2
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
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/x-x+y/y-(x+y)(x-y)/y² y/x=2
4+12(x-y)+9(x-y)^
(x-y)^2+12(x-y)+36
(x+y)^2+6(x+y)+9
(x+y)^2-9(x+y)+18
化简y(x+y)+(x+y)(x-y)-x^2
4-12（x-y）+9(x-y)^2 因式分解
4-12(x-y)+9(x-y)^2因式分解
9(x-y)^2+12(x-y)+4因式分解
9(x-y)^2-12(x-y)+4=快
4+12(x-y)+9(x-y)^2用因式分解
4（x+y）^2-12(x+y)+9因式分解
9-12(x+y)+4(x+y)^2因式分解
分解因式:4(x+y)^2-12(x+y)+9