3(x-1)的平方-18(x-1)+27 因式
问题描述:
3(x-1)的平方-18(x-1)+27 因式
答
3(x-1)的平方-18(x-1)+27
=3[(x-1)^2-6(x-1)+9]
=3(x-1-3)^2
=3(x-4)^2
=3(x+2)(x-2)