因式分解:x三次方-3x二次方+x+2=?
问题描述:
因式分解:x三次方-3x二次方+x+2=?
答
=x三次方-2x二次方-x二次方+x+2
=x²(x-2)-(x²-x-2)
=x²(x-2)-(x+1)(x-2)
=(x²-x-1)(x-2)