证明(x^2+4)/(x+2)的极限在x趋向于-2时为-4

题目

证明(x^2+4)/(x+2)的极限在x趋向于-2时为-4

答案

lim(x->-2) (x^2-4)/(x+2) 该是这样吧!
=lim(x->-2) (x+2)(x-2)/(x+2)
=lim(x->-2) (x-2)
=-4