【简答题】(本小题满分12分) 已知函数 , (Ⅰ)讨论函数 的单调区间和极值点; (Ⅱ)若函数 有极值点 ,记过点 与原点的直线斜率为 。是否存在 使 ?若存在,求出 值;若不存在,请说明理由。
【单选题】While our city tries impatiently to change its appearance by tearing down old buildings, more and more citizens are suggesting ways to ____ the historically important architecture. [ ]
【简答题】若函数 在点 处存在极值 ,则 a= ,b= 。
【单选题】下列命题中正确的为
A.
若x0为f(x)的极值点,则必有f'(x0)=0
B.
若f'(x)=0,则点x0必为f(x)的极值点
C.
若f'(x0)≠0,则点x0必定不为f(x)的极值点
D.
若f(x)在点x0处可导,且点x0为f(x)的极值点,则必有f'(x0)=0
【单选题】在日月引力作用下,海平面发生周期性升降的现象称为
【判断题】康德曾说过“追求知识是为了摆脱愚蠢”。()
【简答题】阅读理解。 With the development of material prosperity (繁荣), advertisements have become more and more important in our daily life. Advertisements give the newest information about products. If there were n...
【多选题】How do the foreigners hung up(挂断) the phone? ( )
A.
OK,good-bye, good night.
B.
Alright. Great. Talk to you soon. Bye.
C.
Sounds good. I will be in touch, bye.
D.
All right then. See you later, bye.
【简答题】若函数 有小于零的极值点,则实数 a 的取值范围为( )。