1、2x²(y+2)-3y²(x-3)-12xy
=2x²y+4x²-3xy²+9y²-12xy
=
2、x²-4xy+4y²-6x+12y+8
=(x-2y)²-6(x-2y)+8
=(x-2y-2)(x-2y-4)
3、x²-(2a+1)x-3a(a-1)
=(x-3a)(x+a-1)
因式分解 1、2x^2(y+2)-3y^2(x-3)-12xy 2、x^2-4xy+4y^2-6x+12y+8 3、x^
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