x2-y2-2y-1 因式分解

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x2-y2-2y-1 因式分解
x2-y2-2y-1 因式分解

x2-y2-2y-1 因式分解
原式=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x-y-1)(x+y+1)
这题的关键是怎样搭配,祝你开心~O(∩_∩)O!
注：x^2表示x的二次方

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

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

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