已知动点P在双曲线C:上,双曲线C的左、右焦点分别为
,
,则下列结论:
①C的离心率为2;
②C的焦点弦最短为6;
③动点P到两条渐近线的距离之积为定值;
④当动点P在双曲线C的左支上时,的最大值为
.
其中正确的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
2023·河南·二模 查看更多[4]
河南省五市2023届高三二模数学试题(文)四川省南充市嘉陵第一中学2022-2023学年高二下学期期中理科数学试题(已下线)河南省五市2023届高三下学期第二次联考数学(文)试题(已下线)专题3.2 双曲线(5个考点十大题型)(3)
更新时间:2023-04-23 18:30:46
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解题方法
【推荐1】已知双曲线
,
分别为其左、右焦点,过
的直线
与双曲线
的左、右两支分别交于
两点,若
,则双曲线
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b9e73b362e724fa3db6c1c13fa26da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122ba80be450e578bef55b932232e884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55798b607d24e18b3cc57c3c683d504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知
分别为双曲线
的左,右顶点,点P为双曲线C上异于
的任意一点,记直线
,直线
的斜率分别为
.若
,则双曲线
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bf4fd84818abac17a9d21237ac5ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90963760acac7bfad3ae03088c6c80b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a690a05dc243e3c6736a6de514106ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.2 | B.![]() | C.![]() | D.![]() |
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【推荐1】双曲线
的一条渐近线方程为
,
、
分别为双曲线的左、右焦点,双曲线左支上的点到
的距离最小值为
,则双曲线方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3040b6c904477030ecf8ba20b2b18759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3b4416a186069ad6dbe9d9c1ed76e8.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/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】已知双曲线
的右支上的点
,
满足
,
分别是双曲线的左右焦点),则
为双曲线
的半焦距)的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4cbee535f73e0a7e0f29879c00fadd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fde7933fb5200a085b103891e33c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐1】过点
的两条直线
,
分别与双曲线
:
相交于点
,
和点
,
,满足
,
(
且
).若直线
的斜率
,则双曲线
的离心率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e584f799ea554fc5533925ead4672501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d5b06acfc8825f60bd730bf32c3c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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A.![]() | B.![]() | C.2 | D.![]() |
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解题方法
【推荐2】已知双曲线C的方程为
,给出下列四个结论:
①m的取值范围是
;
②C的焦距与m的取值无关;
③当C的离心率不小于2时,m的最小值为
;
④存在实数m,使得点
在C上.
其中结论正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a13e3b55d5371687907555c6885849.png)
①m的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b62ea7de9572d6c8e7fcdf03af761f.png)
②C的焦距与m的取值无关;
③当C的离心率不小于2时,m的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
④存在实数m,使得点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1832bbfc9efe969d88c228b431a4fb24.png)
其中结论正确的个数为( )
A.1 | B.2 | C.3 | D.4 |
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