计算极限Limx2-2x-3分之X2-9

分类: 作业答案 • 2021-12-30 12:35:36

问题描述：

答

lim (x²-9)/(x²-2x-3) x趋近于3
=lim(x+3)(x-3)/(x+1)(x-3) x趋近于3
=lim(x+3)/(x+1) x趋近于3
=(3+3)/(3+1)
=3/2