因式分解81a^4-b^4
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因式分解81a^4-b^4
![因式分解81a^4-b^4](/uploads/image/z/15178337-17-7.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A381a%5E4-b%5E4)
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81a^4-b^4
=(9a^2)^2-(b^2)^2
=(9a^2+b^2)(9a^2-b^2)
=(9a^2+b^2)(3a+b)(3a-b)
81a^4-b^4
=(9a^2)^2-(b^2)^2
=(9a^2+b^2)(9a^2-b^2)
=(9a^2+b^2)(3a+b)(3a-b)