因式分解:x^2y^2+1-2xy=
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因式分解:x^2y^2+1-2xy=
因式分解:x^2y^2+1-2xy=
因式分解:x^2y^2+1-2xy=
x^2y^2+1-2xy=(xy-1)²
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因式分解:x^2y^2+1-2xy=
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