<br /> 函数<img src="https://static.zxtiku.com/wangke/imgs/topic/9953c1a3f0a55a16f33e0c142b8a92d6.png"/> 在点<img src="https://static.zxtiku.com/wangke/imgs/topic/abaae4078c6c4e77b13120ca86af6508.png"/> 处<img src="https://static.zxtiku.com/wangke/imgs/topic/144a4720740cec62bee23fd4ba0ae119.png"/> 时的改变量和微分分别是( ).