设曲线<img src="https://static.zxtiku.com/wangke/imgs/topic/98f028ae53c14090e644d3d8fb605aac.jpg"/>在区间<img src="https://static.zxtiku.com/wangke/imgs/topic/04740abe7228f643f75ba77aa5d3bdae.jpg"/>内处处有切线,若曲线位于任一点切线的上方,则称曲线<img src="https://static.zxtiku.com/wangke/imgs/topic/98f028ae53c14090e644d3d8fb605aac.jpg"/>在<img src="https://static.zxtiku.com/wangke/imgs/topic/04740abe7228f643f75ba77aa5d3bdae.jpg"/>内是凸的 <br/> 正确 <br/> 错误