-(a^2-5a-2)+3(-3a+2a-7)化简
问题描述:
-(a^2-5a-2)+3(-3a+2a-7)化简
答
-(a²-5a-2)+3(-3a+2a-7)
=-a²+5a+2-9a+6a-21
=-a²-4a-19
=-(a²+4a+19)