(1)求以椭圆
的长轴端点为焦点,焦点为顶点的双曲线方程;
(2)已知
为抛物线
的焦点,点
在抛物线
上,且
,求抛物线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e78f1a9cc4dedc05c175ab99b288b9f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff3e659ef5fef3526c7772f21c68742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b5d4c92cd24513222a336ad5a5ff25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2021-11-27 22:15:36
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解答题-问答题
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解题方法
【推荐1】设
,
,分别为椭圆
:
(
)的左、右焦点,过
的直线
与椭圆
相交于
、
两点,直线
的倾斜角为
,
到直线
的距离为
.
(1)求椭圆
的焦距;
(2)如果
,求椭圆
的方程.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a6f362a7f8f972d6b329a882e940d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a8ce713e8c40e21841ee757bb03e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】你能用圆规作出图中椭圆焦点的位置吗?你的依据是什么?
![](https://img.xkw.com/dksih/QBM/2021/2/6/2652429506543616/2652468196499456/STEM/a603b0ca-c30d-4724-b292-dceae338a84b.png?resizew=244)
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【推荐1】已知椭圆
,点A,B分别是它的左、右顶点,一条垂直于x轴的动直线l与椭圆相交于P,Q两点,当直线l与椭圆相切于点A或点B时,看作P,Q两点重合于点A或点B,求直线
与直线
的交点M的轨迹方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b861ba40387cb2bcd04945f5a371a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
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【推荐2】如图,已知椭圆
的左焦点为
,右顶点为
,上顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d6bf7230-1f66-4a91-9cf6-87da128a0afc.png?resizew=175)
(1)若椭圆
的离心率为
,线段
中点
,求
的值;
(2)若
外接圆的圆心在直线
上,
外接圆的半径为3,求椭圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9125cf40f225e6ec6342ca327597871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d6bf7230-1f66-4a91-9cf6-87da128a0afc.png?resizew=175)
(1)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482d0637c54cf110d9c7c426355f7987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c2f99ac2b6bc91b983628b68a5cd0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1d8d5cea065075fe50706abe3ae802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
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解答题-证明题
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【推荐1】已知双曲线
的左、右焦点分别为
,
,且
,
是C上一点.
(1)求C的方程;
(2)过点
的直线与C交于两点A,B,与直线
交于点N.设
,
,求证:
为定值.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb0304a3fcc70718c810645fdd8e0d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f1828bca46b9aeddd39374af8c2bd0.png)
(1)求C的方程;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e584f799ea554fc5533925ead4672501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9036ef6ca8f0784842f7240740e3233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770df925dc6286c73505a5e51f98d6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45996655edb44a3123bc97663ca28a50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
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【推荐2】平面直角坐标系
中,双曲线
过点
,且该双曲线虚轴长为
.
(1)求双曲线E的方程;
(2)设过点
的直线l与E的左支交于点M,N,直线DM,DN与y轴相交于P,Q两点.
①求直线l的斜率k的取值范围;
②求|TP|+|TQ|的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c8a21feea025b893382fc8fdb8425a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13af88ff0045b330325a2a55bb3e7a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(1)求双曲线E的方程;
(2)设过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57502a580c6aee9992af061073855e06.png)
①求直线l的斜率k的取值范围;
②求|TP|+|TQ|的取值范围.
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【推荐1】如图是一种加热食物的太阳灶,上面装有可旋转的抛物面形的反光镜,镜的轴截面是抛物线的一部分,盛食物的容器放在抛物线的焦点处,容器由若干根等长的铁筋焊接在一起的架子支撑.已知镜口圆的直径为8m,镜深1m.
(1)建立适当的坐标系,求抛物线的方程和焦点的位置;
(2)若把盛水和食物的容器近似地看作点,试求每根铁筋的长度.
(1)建立适当的坐标系,求抛物线的方程和焦点的位置;
(2)若把盛水和食物的容器近似地看作点,试求每根铁筋的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/e4a61426-3612-424f-867a-6d83475d3e11.png?resizew=189)
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【推荐2】已知平面直角坐标系中点
和直线
,动圆
过点
且与直线
相切.
(1)求
的轨迹
的方程;
(2)过点
作斜率为1的直线
交曲线
于
两点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092fd1b1d33979818300cd2e3699bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28062ef6b7d6fa9e539d0f0b7571b51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34517f479fb08f6096d2fb0362f3ad0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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