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       C.6ec8aac122bd4f6e                      D.6ec8aac122bd4f6e

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       A.6ec8aac122bd4f6e                      B.6ec8aac122bd4f6e

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5.以线段6ec8aac122bd4f6e为直径的圆的方程为                                 (    )

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

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4.已知向量6ec8aac122bd4f6e.如果6ec8aac122bd4f6e,那么实数x的值为                           (    )

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

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3.如果直线6ec8aac122bd4f6e的一条渐近线,那么该双曲线的离心率等于

                                                                                                                              (    )

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

 

 

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2.数列6ec8aac122bd4f6e的前n项和为                                           (    )

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1.已知i是虚数单位,复数6ec8aac122bd4f6e在复平面内对应的点在                                  (    )

       A.第四象限            B.第三象限            C.第二象限            D.第一象限

 

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