lim x趋于2x^2-4/x-2

问题描述:

lim x趋于2x^2-4/x-2

lim(x趋于2) (x^2 -4) /(x-2)
=lim(x趋于2) (x+2)*(x-2) /(x-2)
=lim(x趋于2) (x+2) 代入x=2
=4
故极限值为4