2024高三下·全国·专题练习
1 . 已知圆锥
中,AB为直径,弦RQ的中点为C,过C作SA的平行线与SB交于点P,求作过P,Q,R三点的截面.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63cb21e0ee66f7507ea72660ad94636c.png)
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21-22高二·江苏·课后作业
2 . 已知
,点
,
,直线
.求证:点P到直线l的距离等于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a449474e7cf366add572ca32014a23e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7775aa57ca0e62216f3039ed88dceed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6d06b9a4d3a891ea7c986b1ab4e925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c75f0d9463771a3aba1865a9d9d398aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac654a052f98d1ccb7fede1f122cec3.png)
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21-22高二·江苏·课后作业
3 . (阅读题)在工程中,画拱宽为
,拱高为h的抛物线,常用下面的画法:
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922744018354176/2926841093423104/STEM/222e3b73-a91a-45eb-86d2-8b0b73eee836.png?resizew=223)
(1)作矩形ABCD,使
,
;
(2)分别取CD,AB的中点O,H,把线段DA,OD,HA各n等分;
(3)如图连线得到各交点,将交点连成光滑曲线,就得到抛物线的一半;
(4)用同样方法画出抛物线的另一半.
你能说明上述画法的正确性吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922744018354176/2926841093423104/STEM/222e3b73-a91a-45eb-86d2-8b0b73eee836.png?resizew=223)
(1)作矩形ABCD,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71395d5bdfebf7960d2c1e8e6d62f695.png)
(2)分别取CD,AB的中点O,H,把线段DA,OD,HA各n等分;
(3)如图连线得到各交点,将交点连成光滑曲线,就得到抛物线的一半;
(4)用同样方法画出抛物线的另一半.
你能说明上述画法的正确性吗?
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解题方法
4 . 已知抛物线
的焦点为
,
为
上任意一点,且
的最小值为1.
(1)求抛物线
的方程;
(2)已知
为平面上一动点,且过
能向
作两条切线,切点为
,记直线
的斜率分别为
,且满足
.
①求点
的轨迹方程;
②试探究:是否存在一个圆心为
,半径为1的圆,使得过
可以作圆
的两条切线
,切线
分别交抛物线
于不同的两点
和点
,且
为定值?若存在,求圆
的方程,不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9158f21b372fd0390fab040ad65c586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493875c56db5cf73d6417923c6cecb9d.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4099122dfb15704bb265197e1bc74e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dca1726d463bd741c904abd9b6589056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c30af83767217e6497d2ef64b9793b6.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②试探究:是否存在一个圆心为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2186fca32ea8c51488e6f181fd23366e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0abef37676985bd2340ccfaae2c70192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47d15440b1d85569fe5f2298a3536ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a594cd950e1ae2eb2c19eccf309f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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2022高三·全国·专题练习
5 .
个抛物线最多分平面为
份,
个最多分
份,求
个抛物线最多分平面为几份?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78c013cb4fc61193b651072d5e15de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
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名校
6 . 设
为抛物线
上的动点.
(1)若点
的纵坐标为
,求点
与抛物线
的焦点之间的距离;
(2)过点
分别作两条直线交抛物线
于
、
两点,交直线
于
两点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2feb2ddf17112190235ac1a2259601d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159a2d4945049c5a8f525f18763eba91.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2feb2ddf17112190235ac1a2259601d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12675b38cf628368b125710787da40b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8318418fd02120c4efa0a53f5d2dd945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890271ec9c65b6e195e21671f1675d13.png)
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名校
解题方法
7 . 已知点
,
在抛物线
上.
(1)若
,记线段
的中点为M,求点M到y轴的最短距离;
(2)若点
,
在直线
上,且满足四边形
为正方形,求此正方形的面积.
![](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/8e8953ded144195804384dcb494d5e2a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368fc197b61e01fe6a4a168bb7b375cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fceb9eb57ca36db386ffafeda213599c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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