已知直线
与抛物线
相交于A,B两点,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eaa224254a49065d213ca3a2f75f0db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
17-18高二上·黑龙江牡丹江·阶段练习 查看更多[3]
更新时间:2022-02-28 20:19:49
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【知识点】 求直线与抛物线相交所得弦的弦长
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解答题-问答题
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解题方法
【推荐1】已知抛物线
,其焦点F到其准线的距离为2,过焦点F且倾斜角为45°的直线l交抛物线C于A,B两点,
(1)求抛物线C的方程及其焦点坐标;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
(1)求抛物线C的方程及其焦点坐标;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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【推荐2】如图,在平面直角坐标系
中,抛物线
与圆
的一个交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fdaf8e8a-96b8-4eb9-a369-24334dc6fc93.png?resizew=140)
(1)求抛物线
及圆
的方程;
(2)设直线
与圆
相切于点
,与抛物线
交于
两点,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292e036ca7fb29152d1c5b1cd8312bb5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fdaf8e8a-96b8-4eb9-a369-24334dc6fc93.png?resizew=140)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9218c83d28dd299016c9c09e5f888e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b7fdcd237d89fd82b977ed60655ed2.png)
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