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       A.                 B.                    C.2                        D.3

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3.双曲线的焦距为4,则离心率等于                                                  (   )

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       A.(0,3)             B.[0,3]                C.              D.

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2.函数的值域为                                                          (    )

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       A.[0,1]                B.                  C.                  D.

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1.若集合=                                 (    )

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19.答:       

 

 

 

 

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  18.答:                                             

                                                        

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17.①答:                                           

                                                        

②答                                              

                                                        

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16.答:                                             

                                                        

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