x^2-y^2+2x-4y-3因式分解
3个回答

x²-y²+2x-4y-3

原式=x²+2x+1-y²-4y-4

=﹙x²+2x+1﹚-﹙y²+4y+4﹚

=﹙x+1﹚²-﹙y+2﹚²

=﹙x+1-y-2﹚﹙x+1+y+2﹚

=﹙x-y-1﹚﹙x+y+3﹚