解题方法
1 . 已知
分别是双曲线
的左、右焦点,
是双曲线
上的一点,且
,双曲线的离心率是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38928a92bc4b44ed3c9b89769f5372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d44c0694b280ef9b773309c0f365c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0603978852b7440a5f57e4c9d1b7db.png)
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2 . 已知
,
是椭圆C:
的左、右焦点,P为C上异于顶点的一点,
的平分线PQ交x轴于点Q.若
,则椭圆C的离心率为______ .
![](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/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94fe48bf7af022ecbbe13833fdcc2c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f1276de091642e40f844900c637ca2.png)
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3 . 如图,在一个高为20,底面半径为2的圆柱形乒乓球筒的上壁和下壁分别粘有一个乒乓球,下壁的乒乓球与球筒下底面和侧面相切,上壁的乒乓球与球筒上底面和侧面相切(球筒和乒乓球厚度均忽略不计).一个平面与两个乒乓球均相切,已知该平面截球筒边缘所得的图形为一个椭圆,请写出此椭圆的一个标准方程__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/17e2d397-586e-40c1-b176-1ba000514a81.png?resizew=80)
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4 . 已知抛物线
的焦点为
,过点
的直线交抛物线
于
两点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99296bab1b42898e7ca336a822510258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f8c5a4ba073d03d2951a8ca63a04b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
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解题方法
5 . 如图,是棱长为4的正方体
,点
在正方体的内部且满足
,则
到面
的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb32b414d7cb9c5734f893a1ce5140f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8945feca26a1960e7414511524beed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/a7e106fb-9f8c-45f4-8852-cf84733226f0.png?resizew=171)
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6 . 一种糖果的包装纸由一个边长为3的正方形和两个等腰直角三角形组成(如图1),沿
,
将这两个三角形折起到与平面
垂直(如图2),连接
,
,
,
,若点
满足
且
,则
的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba37da53981e14f04c7e6c4fd09b90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24c686fbaaa68705d654b880481ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa64009879efc50d310d24052fe5c8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/5f9d0979-d865-46cf-8c0f-2cc320fdb676.png?resizew=313)
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7 . 已知圆
,圆
,若存在
使得两圆有公共点,则实数a的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9081e70d763a3a6076e7fe5b1c7e0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be602fc4863b135f6aab74abcbb30acb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d59d0cf265e4b0e653a3a1d7818752.png)
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8 . 已知
,
,
,
成等差数列,
,
,
成等比数列,则
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa342fc81c60724ad5a8ce9dfa81aad.png)
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9 . 已知双曲线
的左焦点为
,则左焦点
到双曲线的渐近线的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ee700ae61a7ca6dd3881ed05ea34d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
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10 . 已知直线
,
,则直线
与
间的距离为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3f4296e5aaae5b362c4d3be53a49ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b769fcf6f6fb460b2064b1ff3775fa0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
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