(a-3)(a+7)-(3a+7)(2a-1)化简
问题描述:
(a-3)(a+7)-(3a+7)(2a-1)化简
答
(a-3)(a+7)-(3a+7)(2a-1)
=a^+4a-21-6a^-11a+7
= -5a^-7a-14