x²-y²-2xz+z²-a²-2ay
=(x²-2xz+z²)-(a²+2ay+y²)
=(x-z)²-(a+y)²
=[(x-z)+(a+y)][(x-z)-(a+y)]
=(x-z+a+y)(x-z-a-y)
（x²-4y²）+（4y-1）
=x²-4y²+4y-1
=x²-(4y²-4y+1)
=x²-(2y-1)²
=[x+(2y-1)][x-(2y-1)]
=(x+2y-1)(x-2y+1)
因式分解:1.x²-y²-2xz+z²-a²-2ay2.（x²-4y&
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