limx趋于-4 x＋4/x²+2x-8求极限

分类: 作业答案 • 2021-12-18 21:36:44

问题描述：

答

limx趋于-4 x＋4/x²+2x-8
=limx趋于-4 (x＋4)/(x+4)(x-2)
=limx趋于-4 1/(x-2)
=1/(-4-2)
=-1/6