1 . 已知抛物线
的焦点为
,直线
交抛物线于不同的
两点.
(1)若直线
的方程为
,求线段
的长;
(2)若直线
经过点
,点
关于
轴的对称点为
,求证:
三点共线;
(3)若直线
经过点
,抛物线上是否存在定点
,使得以线段
为直径的圆恒过点
?若存在,求出点
的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](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/01c74a907dda6bb7d9d56d009d9df253.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cc0f9aa168e43cc5759f017d69b498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc974093c70ddb5acdbae59378bed42.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd99db7870f44cc39d36e7a7b9beb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
2021-05-11更新
|
1030次组卷
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5卷引用:上海市松江区2021届高三二模数学试题
上海市松江区2021届高三二模数学试题(已下线)考向25 直线与方程-备战2022年高考数学一轮复习考点微专题(上海专用)上海市控江中学2022届高三下学期3月月考数学试题上海市格致中学2023届高三下学期3月阶段性测试数学试题上海市浦东新区建平中学2024届高三下学期2月考试数学试卷
名校
2 . 已知抛物线
为其焦点,
为其准线,过
任作一条直线交抛物线于
两点,
分别为
在
上的射影,
为
的中点,给出下列命题:①
;②
;③
;④
与
的交点在
轴上;⑤
与
交于原点.其中真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bde4a191eb382428f01989a83c5dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c64298f6e7554ce11472f2197d45b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba39684b3819c6cf1f74bd0eb76ea311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c64298f6e7554ce11472f2197d45b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0b1f7beea61a584d7550fade4c6950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7af3d5765382269f380d39b0ffc9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb890665a6f49c1a912af5e686fa3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71fe246270d1277f9eb2bf15af22e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
A.2个 | B.3个 | C.4个 | D.5个 |
您最近一年使用:0次
2020-12-13更新
|
341次组卷
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4卷引用:上海市位育中学2021届高三三模数学试题
上海市位育中学2021届高三三模数学试题(已下线)课时38 抛物线-2022年高考数学一轮复习小题多维练(上海专用)上海市曹杨第二中学2024届高三上学期开学考试数学试题宁夏海原第一中学2021届高三上学期第二次月考数学(理)试题
名校
3 . 平面直角坐标系
中,抛物线
的焦点为F,过F的直线
交
于B,C两点.
(1)若
垂直于轴,且线段BC的长为1,求
的方程;
(2)若
的斜率为
,求
;
(3)设抛物线上异于
的点A满足
,若
的重心在
轴上,求
的重心的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c38bdb4c0a59b645f2965cdcceab429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8156f76e45f4f45964ad9b45b38da34b.png)
(3)设抛物线上异于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505b6a2ffbe5eee08156c30c8e41dbd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
2020-01-10更新
|
327次组卷
|
2卷引用:上海市七宝中学2021届高三冲刺模拟卷一数学试题