化简(5a²+2a)-4(2+2a²).

问题描述:

化简(5a²+2a)-4(2+2a²).

(5a²+2a)-4(2+2a²)
=5a^2+2a-8-8a^2
=(5-8)a^2+2a-8
=-3a^2+2a-8

=5a^2+2a-8-8a^2
=-3a^2+2a-8