- 18
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下列命题中正确的为( )
- A.若x<sub>o</sub>为f(x)的极值点,则必有,f'(x<sub>o</sub>)=0
- B.若f'(x<sub>o</sub>)=0,则点xo必为f(x)的极值点
- C.若f'(x<sub>o</sub>)≠0,则点xo必定不为f(x)的极值点
- D,若f(x)在点x<sub>o</sub>处可导,且点x<sub>o</sub>为f(x)的极值点,则必有f'(x<sub>o</sub>)=0
- 20
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( )
- A.3
- B.6
- C.9
- D.9e
- A.O <img alt="" src="//img1.yqda.net/question-name/f5/fc002268b5238e23316aa4e37aea96.jpg" />
- C.1 <img alt="" src="//img1.yqda.net/question-name/97/9891873098d10d6aee9e680d14bdc2.jpg" />
- A.1
- B.2
- C.3
- D.4
- 27
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( )
- A.<img src="//img1.yqda.net/question-name/5f/d6100c63c8d9c07f5da57f716e1b52.png" width="61" height="40" />
- B.<img src="//img1.yqda.net/question-name/f7/67dde30b299508c200995abe152653.png" width="57" height="39" />
- C.<img src="//img1.yqda.net/question-name/5f/e31e0085aec9724a265f3e200acba9.png" width="45" height="45"/>
- D.<img src="//img1.yqda.net/question-name/10/6f90dfc875f31fc2ec744e08745cc6.png" width="55" height="41" />
- 28
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设A是一个常数,
( )
- A.单调增加且收敛
- B.单调减少且收敛
- C.收敛于零
- D.发散