化简(a+1)(a-2)/(a+2)(a-2)+3
问题描述：
化简(a+1)(a-2)/(a+2)(a-2)+3
答
4a+7／a+2
答
=(a+1)(a-2)/(a²-4+3)
=(a+1)(a-2)/(a²-1)
=(a+1)(a-2)/(a+1)(a-1)
=(a-2)/(a-1)