X3-X2-X+1=0怎么进行因式分解啊?
问题描述:
X3-X2-X+1=0怎么进行因式分解啊?
答
X3-X-(X2-1)
=x(x2-1)-(x2-1)
=(x2-1)(x-1)
=(x+1)(x-1))(x-1)
=(x+1)(x-1)²