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问题: (a平方+a+1)(a平方-6a+1)+12a平方

解答:

(a²+a+1)(a²-6a+1)+12a²
=[(a²+1)+a][(a²+1)-6a]+12a²
=(a²+1)²-5a(a²+1)+6a²
=[(a²+1)-2a][(a²+1)-3a]
=(a-1)²(a²-3a+1)