因式分解：x²﹣y²+2x﹣2y a²-x²-2x-2a

因式分解：x²﹣y²+2x﹣2y a²-x²-2x-2a
因式分解：x²﹣y²+2x﹣2y a²-x²-2x-2a

因式分解：x²﹣y²+2x﹣2y a²-x²-2x-2a
原式=(x+y)(x-y)+2(x-y)
=(x-y)(x+y+2)
原式=(a+x)(a-x)-2(a+x)
=(a+x)(a-x-2)

x²﹣y²+2x﹣2y
=(x+y)(x-y)+2(x-y)
=(x+y+2)(x-y)

a²-x²-2x-2a
=(a+x)(a-x)-2(a+x)
=(a+x)(a-x-2)

x²﹣y²+2x﹣2y
=(x²﹣y²)+(2x﹣2y )
=(x+y)(x-y)+2(x-y)
=(x-y)(x+y+2)

a²-x²-2x-2a
=(a²-x²)-(2x+2a)
=(a+x)(a-x)-2(x+a)
=(a+x)(a-x-2)

x²﹣y²+2x﹣2y =(x²-y²)+2(x-y)=(x+y)(x-y)-2(x-y)=(x-y)(x+y-2)
a²-x²-2x-2a=(a²-2a+1)-x²-2x-1=(a-1)²-(x+1)²=(a-1+x+1)(a-1-x-1)=(a+x)(a-x-2)

1:x²﹣y²+2x﹣2y =(x²﹣y²)+2(x-y)=(x+y)(x-y)+2(x-y)=(x-y)(x+y+2)
2: a²-x²-2x-2a=(a²-x²)-2(x+a)=(a+x)(a-x)-2(a-x)=(a-x)(a+x-2)