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函数的定义域为 。

 

函数6ec8aac122bd4f6e的定义域为              

 

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定义在R上的函数6ec8aac122bd4f6e满足6ec8aac122bd4f6e,则6ec8aac122bd4f6e的值为

                                                                                                                              (    )

       A.-1                       B.0                        C.1                        D.2

 

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函数6ec8aac122bd4f6e在同一直角坐标系下的图象大致是                 (    )

说明: 6ec8aac122bd4f6e

 

 

 

 

 

 

 

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已知命题6ec8aac122bd4f6e:关于6ec8aac122bd4f6e的函数6ec8aac122bd4f6e在[1,+∞)上是增函数,命题6ec8aac122bd4f6e:关于6ec8aac122bd4f6e的函数6ec8aac122bd4f6e在R上为减函数,若6ec8aac122bd4f6e6ec8aac122bd4f6e为真命题,则6ec8aac122bd4f6e的取值范围是                            (    )

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

 

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已知6ec8aac122bd4f6e                   (    )

       A.6ec8aac122bd4f6e                B.6ec8aac122bd4f6e                   

       C.6ec8aac122bd4f6e                      D.6ec8aac122bd4f6e

 

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函数6ec8aac122bd4f6e的最大值是                      (    )

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

 

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