A、若<img src="https://learning.mhtall.com/upload/uc_course/10023/D97BB2E1AB1FB6F90223A3B2FD52807E6921771D.png" alt="">为函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="">的驻点，则<img src="https://learning.mhtall.com/upload/uc_course/10023/D97BB2E1AB1FB6F90223A3B2FD52807E6921771D.png" alt="" style="white-space:normal;">必为函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="" style="white-space:normal;">的极值点
B、函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="" style="white-space:normal;">导数不存在的点，一定不是函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="" style="white-space:normal;">的极值点
C、若函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="" style="white-space:normal;">在<img src="https://learning.mhtall.com/upload/uc_course/10023/D97BB2E1AB1FB6F90223A3B2FD52807E6921771D.png" alt="" style="white-space:normal;">处取得极值，且<img src="https://learning.mhtall.com/upload/uc_course/10023/D5205F6B31AE6A9C3F4533AC55154C16C675E1B5.png" alt="">存在，则必有<img src="https://learning.mhtall.com/upload/uc_course/10023/D5205F6B31AE6A9C3F4533AC55154C16C675E1B5.png" alt="" style="white-space:normal;">=0
D、若函数<img src="https://learning.mhtall.com/upload/uc_course/10023/7AA956B50DEE0890B687D45FF23D3F47AEB162F6.png" alt="" style="white-space:normal;">在<img src="https://learning.mhtall.com/upload/uc_course/10023/D97BB2E1AB1FB6F90223A3B2FD52807E6921771D.png" alt="" style="white-space:normal;">处连续，则<img src="https://learning.mhtall.com/upload/uc_course/10023/D5205F6B31AE6A9C3F4533AC55154C16C675E1B5.png" alt="" style="white-space:normal;">一定存在