(a-1)的平方乘上(3a-2)+(2-3a)

问题描述:

(a-1)的平方乘上(3a-2)+(2-3a)

(a-1)的平方乘上(3a-2)+(2-3a)
=(a-1)的平方乘上(3a-2)-(3a-2)
=[(a-1)²-1](3a-2)
=(a-1+1)(a-1-1)(3a-2)
=a(a-2)(3a-2)