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 对于实数a (a>0且a ≠1), 函数f (x) = a x-2-3的图象过定点          

 

 6ec8aac122bd4f6e函数6ec8aac122bd4f6e的图象是圆心在原点的单位圆的两段弧(如图),则不等式6ec8aac122bd4f6e的解集为   (     )

A.6ec8aac122bd4f6e

B.6ec8aac122bd4f6e

C.6ec8aac122bd4f6e

D.6ec8aac122bd4f6e

 

 已知函数6ec8aac122bd4f6e,若存在实数6ec8aac122bd4f6e,当6ec8aac122bd4f6e时,6ec8aac122bd4f6e恒成立,则实数6ec8aac122bd4f6e的最大值是                                                               (     )

A.6                B.5                 C.4                 D.3

 

 设6ec8aac122bd4f6e是方程6ec8aac122bd4f6e的实根,则6ec8aac122bd4f6e的最小值是(     )

A.6ec8aac122bd4f6e            B. 8               C.18                 D.14

 

 已知6ec8aac122bd4f6e是R上的偶函数,对任意6ec8aac122bd4f6eR, 都有6ec8aac122bd4f6e,且6ec8aac122bd4f6e,则6ec8aac122bd4f6e的值为                                                            (     )

A.0                B.6ec8aac122bd4f6e             C.2               D.2009                            

 

 “6ec8aac122bd4f6e”是“关于x的方程6ec8aac122bd4f6e至少有一个负根”的         (     )

A.充分不必要条件                  B.必要不充分条件

C.充要条件                        D.既不充分也不必要条件

 

 设6ec8aac122bd4f6e为数列6ec8aac122bd4f6e的前6ec8aac122bd4f6e项和,6ec8aac122bd4f6e,则6ec8aac122bd4f6e取最小值时,6ec8aac122bd4f6e的值为      (     )

A.12                 B.13                C.24              D.25

 

 若函数6ec8aac122bd4f6e的唯一一个零点同时在区间(0,16),(0,8),(0,4),(0,2)内,则下列结论中正确的是                                                             (     )

A.6ec8aac122bd4f6e在区间(0,1)内一定有零点            B.6ec8aac122bd4f6e在区间6ec8aac122bd4f6e内没有零点

C.6ec8aac122bd4f6e在区间(0,1)或(1,2)内一定有零点  D.6ec8aac122bd4f6e在区间(1,16)内没有零点

 

 设6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e,则                                   (     )

A.6ec8aac122bd4f6e    B.6ec8aac122bd4f6e          C.6ec8aac122bd4f6e        D.6ec8aac122bd4f6e  

 

 已知函数6ec8aac122bd4f6e,则 (    )                             

A.6ec8aac122bd4f6e=6ec8aac122bd4f6e          B.6ec8aac122bd4f6e=6ec8aac122bd4f6e

C.6ec8aac122bd4f6e=6ec8aac122bd4f6e          D.6ec8aac122bd4f6e=6ec8aac122bd4f6e

 

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