X^2-y^2-2y-1因式分解

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X^2-y^2-2y-1因式分解X^2-y^2-2y-1因式分解X^2-y^2-2y-1因式分解=x²-(y²+2y+1)=x²-(y+1)²=(x+y+1)(

X^2-y^2-2y-1因式分解
X^2-y^2-2y-1因式分解

X^2-y^2-2y-1因式分解
=x²-(y²+2y+1)
=x²-(y+1)²
=(x+y+1)(x-y-1)