计算:(5a²+2a-1)-4(3-8a+2a²)

问题描述:

计算:(5a²+2a-1)-4(3-8a+2a²)

(5a²+2a-1)-4(3-8a+2a²)
=5a²+2a-1-12+32a-8a²
=(5a²-8a²)+(2a+32a)+(-1-12)
=-3a²+34a-13