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原式=(a4+6a2+9)-9a2=(a2+3a+3)(a2-3a+3),當a=0時,原式=9是合數;當a=1時,原式=7是質數;當a=2時,原式=13也是質數;當a>2時,a2+3a+3>1,a2-3a+3=(a-2)(a-1)+1>1,這說明,此時a4-3a2+9可以分解為...
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