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1 . 若双曲线C:
的左、右焦点为
,
,P是其右支上的动点.若存在P,使得
,
,
依次成等比数列,则t的取值范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c477e5ade921ffa8377c4719319380ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de0159daeb62cb68801c7a6e971f39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de0abff67b3d6f05af6438800524026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8649e0b38e23aa72151ee06dbbf365bf.png)
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