考察函数在点x=-2处是否连续．

A.174.24.96:6088/Latex/latex.action?latex=Zih4KT1cbGVmdFx7XGJlZ2lue2FycmF5fXtjfVxmcmFje3heMi00fXt4KzJ9eCziiaAtMlxcNCx4%0D%0APS0yICBcZW5ke2FycmF5fQ%3D%3D'

【参考答案】

f(x)在x=-2处有定义，f(-2)=4，且

因为，所以f(x)在x=-2处不连续．