(x²+y²)²-4x²y²因式分解怎么做?

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(x²+y²)²-4x²y²因式分解怎么做?
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(x²+y²)²-4x²y²因式分解怎么做?
(x²+y²)²-4x²y²因式分解怎么做?

(x²+y²)²-4x²y²因式分解怎么做?
(x²+y²)²-4x²y²
=x^4+y^4+2x²y²-4x²y²
=x^4+y^4-2x²y²
=(x²-y²)²