求极限 lim(x→∞)5x/(x-4)
=lim(x→∞)5/(1-4/x)
=5/1
=5
求极限 lim(x→-∞)[(√1-x)-3]/2+√x
分母是√x,而x->-∞,所以
没有意义,即题目有误.哦哦，，谢谢第一题是x平方-4lim(x→∞)5x/(x方-4)
=lim(x→∞)(5/x)/(1-4/x方)
=0/1
=0