分解因式:(x²y²+1)²-4x²y²
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分解因式:(x²y²+1)²-4x²y²
分解因式:(x²y²+1)²-4x²y²
分解因式:(x²y²+1)²-4x²y²
(x²y²+1)²-4x²y²
=(x²y²+1+2xy)(x²y²+1-2xy)
=(xy+1)²(xy-1)²
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(x²y²+1)²-4x²y²
=(x²y²+1+2xy)(x²y²+1-2xy)
=(xy+1)²(xy-1)²