分解因式:-(a+1)^2+9(a-2)^2

2025-06-22 07:17:41
推荐回答(3个)
回答1:

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

回答2:

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

回答3:

-(a+1)^2+9(a-2)^2
=9(a-2)^2-(a+1)^2
=【9(a-2)-(a+1)】【9(a-2)+(a+1)】
=(8a-19)(10a-17)