因式分解:﹙x²y²+9﹚²-36x²y²

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因式分解:﹙x²y²+9﹚²-36x²y²

原式=(x²y²+9)²-(6xy)²=(x²y²+9+6xy)(x²y²+9-6xy)=(xy+3)²(xy-3)²

原式=(x²y²+9)²-(6xy)²=(x²y²+9+6xy)(x²y²+9-6xy)=(xy+3)²(xy-3)²