-(a+1)²+9(a-2)²分解公因式?急

问题描述:

-(a+1)²+9(a-2)²分解公因式?急

-(a+1)²+9(a-2)²
=[3(a-2)]²-(a+1)²
=(3a-6)²-(a+1)²
=(3a-6+a+1)(3a-6-a-1)
=(4a-5)(2a-7)
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