若函数<img src="https://static.zxtiku.com/wangke/imgs/topic/e817c5560a9e362d8bae0ff1f8763331.png"/>在<img src="https://static.zxtiku.com/wangke/imgs/topic/5c691840390292f98ce285627ebb2cf0.png"/>处连续，则<img src="https://static.zxtiku.com/wangke/imgs/topic/e817c5560a9e362d8bae0ff1f8763331.png"/>在<img src="https://static.zxtiku.com/wangke/imgs/topic/5c691840390292f98ce285627ebb2cf0.png"/>处极限存在，且极限值等于<img src="https://static.zxtiku.com/wangke/imgs/topic/a25095ea9681dbc7dfcd8c2f15b0892a.png"/>.