a^3-4ab^2-a-2b
=a(a²-4b²)-(a+2b)
=a(a+2b)(a-2b)-(a+2b)
=(a+2b)(a²-2ab-1)望采纳是-4b^2，不是-4ab^2a(a²-1)-2(2b-b)=a[(a-1)(a+1)-2b(2b-b)]这就是答案了，望采纳谢谢前面看错
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