<img src="https://static.zxtiku.com/wangke/imgs/topic/9d5b9ebe03875fa5a0a84395c861af30.jpg"/>的二阶导数是 <br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/c5f66e08c4ca12e8bcc72b69ff21663b.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/4c24597f31864d7ac878fdb643f52771.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/356c11f81e61936b57420a33a664ea09.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/1fdabe1fe8f55a2ef9a6dcc58331cefd.jpg"/>