若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2276b14202c34911935ade73ce2adbac.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6bf4c35030e343beb3815627b042a0e6.png处连续，则偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/987d855cc07242c3b7e7a3c70482da4e.png一定存在。
举一反三
- 若级数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/40dd933d966d4d23be58c68c8e811716.png发散，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/faaa6bd9061c4c139fa21f21083e747b.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f87d20317ab74d1f85d08286f1778fed.png收敛。 ( )<span style="font-family: 宋体;</span><br><span style=";font-family:宋体;font-size:16px<span style="font-family:宋体</span></span><br>
- 设函数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c15bcfdbdd7a4a719d7af2846a9dab3f.png,则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/970d0a703f5b4b5ba0b57402e1999685.png（ ）<span style=";font-family:宋体;font-size:16px<span style="font-family:宋体</span></span><br>
- 若偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a1b21fe4866c4a31bc3d618a2ea3c815.png存在，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7cb9e1dd6acf40e6abfc4d2b731eeef2.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e1a9c8e68bfc4a8f949807cf6c5f0a12.png处连续。<span style="font-family: 宋体;</span><br><br>
- 已知http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e3bc2e8450d446dbb69dc188d0c668f0.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/b654c6ba26924e18a6a93cebd8d2e16d.png（ ）<span style=";font-family:宋体;font-size:16px;position:relative;top:7px<span style="font-family:宋体</span></span><br><br>
- 极限http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2420a68570af4cf7947d9a2bdfc88656.png不存在（ ）<span style=";font-family:宋体;font-size:16px<span style="font-family:宋体</span></span><br>