已知a=-1,求[(a+3)分之(a²-a-6)]²乘以[(a²+a-6)分之(a-3)]的负二次方

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已知a=-1,求[(a+3)分之(a²-a-6)]²乘以[(a²+a-6)分之(a-3)]的负二次方

[(a+3)分之(a²-a-6)]²乘以[(a²+a-6)分之(a-3)]的负二次方=[(a-3)(a+2)/(a+3)×(a+3)(a-2)/(a-3)]²=[(a+2)(a-2)]²=(a²-4)²=a的4次方-8a²+16