计算 (1)(12a3-6a2+3a)÷3a (2)5x2(x+1)(x-1)

问题描述:

计算
(1)(12a3-6a2+3a)÷3a
(2)5x2(x+1)(x-1)

(1)(12a3-6a2+3a)÷3a=4a2-2a+1;
(2)5x2(x+1)(x-1)=5x2(x2-1)
=5x4-5x2