名校
解题方法
1 . 已知双曲线C的渐近线方程为
,点
在双曲线C上,直线
与双曲线交于A,B两点,记
斜率分别为
.
(1)求双曲线C的标准方程;
(2)是否存在常数k,使
为定值
,若存在,求常数k和
的值,不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6bb019e2d7c6d17d15ec4d9043f5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b337c32bd5408c0ed8a9ee9cde4cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5bd66dd6d5e09ff0893a938aed56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90963760acac7bfad3ae03088c6c80b0.png)
(1)求双曲线C的标准方程;
(2)是否存在常数k,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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名校
解题方法
2 . 已知双曲线
的左、右焦点分别为
,
.
(1)若点
,
在双曲线C上,求C的方程;
(2)若点P为双曲线C右支上一点,I为
的内心,且
,过原点O作PI的平行线交
于点K,求证:
,且点I的横坐标等于PK的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2cfa22139b3e9c9a73500e1ba19f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0813ffee858d72c088375b58797d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac596b90c2d071e5fd655e15055ad62.png)
(2)若点P为双曲线C右支上一点,I为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f21c64e8c59bcc7dfcb3339968fd0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b6ccaa6f14b331b6c93461dfd933f3.png)
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