若函数<img src="https://static.zxtiku.com/wangke/imgs/topic/8a2e869a1cebc348440ddd17b12cd8af.png"/>在<img src="https://static.zxtiku.com/wangke/imgs/topic/2e1ae3fed24d978e8ba70e082aed675b.png"/> 点连续，且<img src="https://static.zxtiku.com/wangke/imgs/topic/b7fa0ccadfe1b0050edf189bd37a55cf.png"/>，则存在<img src="https://static.zxtiku.com/wangke/imgs/topic/2e1ae3fed24d978e8ba70e082aed675b.png"/>的某邻域，在此邻域内，有<img src="https://static.zxtiku.com/wangke/imgs/topic/3ee69b216a7d5a706ed02d4970492461.png"/>。（）