2(x+y)(x-y)-(x+y)^2(x-y)^2
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解：因式分解：
2(x+y)(x-y)-(x+y)^2(x-y)^2
=(x+y)(x-y)[2-(x+y)(x-y)]
=(x+y)(x-y)(2-x²+y²)
求值：
2(x+y)(x-y)-(x+y)^2(x-y)^2
=2x²-2y²-(x²-y²)²
=2x²-2y²-x^4+2x²y²-y^4
=-x^4+2(1+y²)x²-y^4-2y²
祝你开心
2(x+y)(x-y)-(x+y)^2(x-y)^2
=(x+y)(x-y)[2-(x+y)(x-y)]
=(x+y)(x-y)(2-x²+y²)
求值：
2(x+y)(x-y)-(x+y)^2(x-y)^2
=2x²-2y²-(x²-y²)²
=2x²-2y²-x^4+2x²y²-y^4
=-x^4+2(1+y²)x²-y^4-2y²
祝你开心
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