x^2-y^2-(x+y)^2因式分解
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x^2-y^2-(x+y)^2因式分解x^2-y^2-(x+y)^2因式分解x^2-y^2-(x+y)^2因式分解=(x+y)(x-y)-(x+y)²=(x+y)【(x-y)-(x+y)】=
x^2-y^2-(x+y)^2因式分解
x^2-y^2-(x+y)^2因式分解
x^2-y^2-(x+y)^2因式分解
=(x+y)(x-y)-(x+y)²
=(x+y)【(x-y)-(x+y)】
= -2y(x+y)
x^2-y^2-(x+y)^2
=x²-y²-(x²+2xy+y²)
=x²-y²-x²-2xy-y²
=-2xy-2y²
=-2y(x+y)
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