x的三次+x的两次-x-1因式分解 - 知识问答

x的三次+x的两次-x-1因式分解

1个回答

x³+x²-x-1
=(x³-x)+(x²-1)
=x(x²-1)+(x²-1)
=(x²-1)(x+1)
=(x+1)(x-1)(x+1)
=(x+1)²(x-1)

相关问题