a²-b²-2b-1因式分解
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a²-b²-2b-1因式分解a²-b²-2b-1因式分解a²-b²-2b-1因式分解a^2-b^2-2b-1=a^2-(b^2+2b+1)=
a²-b²-2b-1因式分解
a²-b²-2b-1因式分解
a²-b²-2b-1因式分解
a^2-b^2-2b-1
=a^2-(b^2+2b+1)
=a^2-(b+1)^2
=[a+(b+1)][a-(b+1)]
=(a-b-1)(a+b+1)
=a^2-(b+1)^2
=(a+b+1)(a-b-1)
只能说同下了