求因式分解:(x²+y²)²-4x²y²

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求因式分解:(x²+y²)²-4x²y²
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求因式分解:(x²+y²)²-4x²y²
求因式分解:(x²+y²)²-4x²y²

求因式分解:(x²+y²)²-4x²y²
原式=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²
补充
原式=x^4+2x²y²+y^4-4x²y²
=x^4-2x²y²+y^4
=(x²-y²)²
=(x+y)²(x-y)²

这样的吧···

(x²-y²)²