<img src="https://static.zxtiku.com/wangke/imgs/topic/339ffc02a3e72f9738f2d09665881fdc.jpg"/>在点<img src="https://static.zxtiku.com/wangke/imgs/topic/1f457b112dd99c7805052d1869611311.jpg"/>解析是<img src="https://static.zxtiku.com/wangke/imgs/topic/339ffc02a3e72f9738f2d09665881fdc.jpg"/>在点<img src="https://static.zxtiku.com/wangke/imgs/topic/1f457b112dd99c7805052d1869611311.jpg"/>的某邻域内可微的____条件.