函数<img src=https://huaweicloudobs.ahjxjy.cn/AB4F32C5031A74D3711EF5A75D12BCDF.png title=QQ图片20160224212803.png alt=QQ图片20160224212803.png/>在<img src=https://huaweicloudobs.ahjxjy.cn/ACB80081FB4ED66DC7E9A1E6041323DB.png title=QQ图片20160224212843.png alt=QQ图片20160224212843.png/>上连续是<img src=https://huaweicloudobs.ahjxjy.cn/A0F85655EC82E4BC3CECB0713C22B44F.png title=QQ图片20160224212906.png alt=QQ图片20160224212906.png/>存在的