谢谢😄 具体的给好评
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谢谢😄 具体的给好评
谢谢😄 具体的给好评
谢谢😄 具体的给好评
x^4-9=(x²+3)(x²-3)
x^4-9
=(x²+3)(x²-3)
=(x²+3)(x+√3)(x-√3)
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