因式分解:81a^4+16b^4-72a^2b^2

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因式分解:81a^4+16b^4-72a^2b^2因式分解:81a^4+16b^4-72a^2b^2因式分解:81a^4+16b^4-72a^2b^281a^4+16b^4-72a^2b^2=(9a^

因式分解:81a^4+16b^4-72a^2b^2
因式分解:81a^4+16b^4-72a^2b^2

因式分解:81a^4+16b^4-72a^2b^2
81a^4+16b^4-72a^2b^2
=(9a^2-4b^2)^2
=[(3a-2b)(3a+2b)]^2
=(3a-2b)^2(3a+2b)^2