因式分解:a³ a²-a-1 因式分解:a³+a²-a-1

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因式分解:a³a²-a-1因式分解:a³+a²-a-1因式分解:a³a²-a-1因式分解:a³+a²-a-1因式分解:a

因式分解:a³ a²-a-1 因式分解:a³+a²-a-1
因式分解:a³ a²-a-1
因式分解:a³+a²-a-1

因式分解:a³ a²-a-1 因式分解:a³+a²-a-1
a³+a²-a-1
=a³-a+ a²-1
=a(a²-1) + (a²-1)
= (a+1) (a²-1)
=(a+1) (a-1) (a+1)
=(a+1)²(a-1)

a(a²-1)

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