分解因式:a^3-2a+1
问题描述:
分解因式:a^3-2a+1
答
a^3-2a+1
=a^3-a-(a-1)
=a(a^2-1)-(a-1)
=a(a-1)(a+1)-(a-1)
=(a-1)[a(a+1)-1]
=(a-1)(a^2+a-1)