因式分解:a대+a눀-a-1

2025-05-13 06:25:26
推荐回答(1个)
回答1:

原式=(a³-1)+(a²-a)
=(a-1)(a²+a+1)+a(a-1)
=(a-1)(a²+2a+1)
=(a-1)(a+1)²