名校
解题方法
1 . 已知抛物线
的焦点为
,
、
是抛物线上两动点,
是平面内一定点,下列说法正确的序号为( )
①抛物线准线方程为
;
②若
,则线段
中点到
轴距离为
;
③以
为圆心,线段
的长为半径的圆与准线相切;
④
的周长的最小值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.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://staticzujuan.xkw.com/quesimg/Upload/formula/2007972af3341f27fbc32ce62dfce5e2.png)
①抛物线准线方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e1bc08cc69d3d8e73b990f1236ed5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
③以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceff3844281849df3e37a2e56e110549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c3ab9b6089175ddcca69027a32e5c7.png)
A.①②④ | B.②③ | C.③④ | D.②③④ |
您最近一年使用:0次
2022-05-10更新
|
505次组卷
|
3卷引用:陕西省西安市周至县2022届高三下学期三模文科数学试题
陕西省西安市周至县2022届高三下学期三模文科数学试题江西省南昌市八一中学2022届高三下学期三模数学(文)试题(已下线)专题3.12 抛物线的标准方程和性质-重难点题型检测-2022-2023学年高二数学举一反三系列(人教A版2019选择性必修第一册)
2 . 如图,点
是曲线
上的任意一点,
,
,射线
交曲线
于
点,
垂直于直线
,垂足为点
.则下列判断:①
为定值
;②
为定值5.其中正确的说法是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/60edb08e-5d5c-4687-8920-162fac037a19.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2049e67012cc849c6a55d40dbed50d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0af1a9647a129a692715564967a8ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378e03d75c73c8ca71f991a8c07729a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce21531a886c50568b75fd4278f15dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca909e0bfdc0a931b1969115e5c524a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb18ca54d4b25ddae3a613d91b20d551.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/60edb08e-5d5c-4687-8920-162fac037a19.png?resizew=199)
A.①②都正确 | B.①②都错误 |
C.①正确,②错误 | D.①都错误,②正确 |
您最近一年使用:0次
2020-07-14更新
|
602次组卷
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5卷引用:上海市徐汇区2019-2020学年高二下学期期末数学试题
上海市徐汇区2019-2020学年高二下学期期末数学试题(已下线)专题5.4 期末考前必做30题(选择题提升版)-2020-2021学年高二数学下学期期末专项复习(沪教版)(已下线)3.3 抛物线沪教版(2020) 选修第一册 同步跟踪练习 期中测试卷(已下线)3.3 抛物线-2021-2022学年高二数学同步精品课堂讲+例+测(苏教版2019选择性必修第一册)