如图,已知抛物线
与直线AB交于
、
两点,与y轴交于点C,顶点为D.
(1)求抛物线的解析式;
(2)求△ABD的面积;
(3)在抛物线的对称轴上是否存在点P,使得△APC是直角三角形?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a0066672fdf6e591b842847e5a6c7c.png)
(1)求抛物线的解析式;
(2)求△ABD的面积;
(3)在抛物线的对称轴上是否存在点P,使得△APC是直角三角形?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/7a48a6c0-4221-475d-9256-581daf2abec7.png?resizew=167)
更新时间:2021-03-03 09:18:52
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相似题推荐
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【推荐1】如图,抛物线L:
与
轴交于
,
两点,点
在该抛物线上,其横坐标分别为k、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
.分别过点C、D 作
轴的垂线,垂足分别为P、Q, 以
为边构造矩形
.设L被该矩形
截得的部分图象(包括边界)记为G.
时,点P是否在L上;
(2)当L的顶点在矩形
的边上时,求k的值;
(3)若图象G只呈上升走势或下降走势,结合图象直接写出k 的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad732e19306e01b065215a487f0d1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff2dba976c68740bbff0d1dda6a870c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dce8b1c2ea5230fb9405fa6a064531e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635e02df6562fd5aad31396311330670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf914fad7391206d26f50fa416a58df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf914fad7391206d26f50fa416a58df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e788c32187ae2cc97aaa24da1d40d.png)
(2)当L的顶点在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81587f9c92833c90c7730874a4b4681.png)
(3)若图象G只呈上升走势或下降走势,结合图象直接写出k 的取值范围.
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【推荐2】如图,抛物线
交
轴负半轴于点
,交
轴负半轴于点
,直线
:
,交
轴于点
,交
轴于点
,且
.
(1)求抛物线的解析式;
(2)证明:对于直线
上任意给定的一点
,在抛物线上总能存在点
,
,使得点
为
的中点;
(3)直线
:
交抛物线于点
,
,记
为点
到直线
的距离,
为点
到直线
的距离,判断
是否存在最小值,若存在,求出最小值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f33473242a8088c897ea2252a7cf8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/386d3214d98cbe433528e47d17f23dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b9fec20fa087fc8fe52a9ff1a2e282.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/29/ce165d59-991a-40e7-b521-1f31748576ef.jpg?resizew=143)
(1)求抛物线的解析式;
(2)证明:对于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6767830cc1811f0f4ea5a008fdc7e723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a4b32d388558eb9a9e4f0f2dd57c09.png)
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解题方法
【推荐1】【问题背景】17世纪有着“业余数学家之王”美誉的法国律师皮耶·德·费马,提出一个问题:求作三角形内的一个点,使它到三角形三个顶点的距离之和最小后来这点被称之为“费马点”.
如图,点
是
内的一点,将
绕点
逆时针旋转60°到
,则可以构造出等边
,得
,
,所以
的值转化为
的值,当
,
,
,
四点共线时,线段
的长为所求的最小值,即点
为
的“费马点”.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967752494538752/2971517476380672/STEM/68105a8c-4752-4415-ba87-f31cc1e6af1f.png?resizew=249)
(1)【拓展应用】
如图1,点
是等边
内的一点,连接
,
,
,将
绕点
逆时针旋转60°得到
.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967752494538752/2971517476380672/STEM/3befee37-0180-41e1-9798-03f9a9757554.png?resizew=204)
①若
,则点
与点
之间的距离是______;
②当
,
,
时,求
的大小;
(2)如图2,点
是
内的一点,且
,
,
,求
的最小值.
如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efc07104b96c12c63663c9d39478493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2f90f1f950f19b10ee0b1852cec730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e894bee6ed320054a967372a5b977430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac6301e2bffb51caa3f3b6907f2e1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97596e74546ee4d30ce17b50655b0913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967752494538752/2971517476380672/STEM/68105a8c-4752-4415-ba87-f31cc1e6af1f.png?resizew=249)
(1)【拓展应用】
如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efc07104b96c12c63663c9d39478493.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967752494538752/2971517476380672/STEM/3befee37-0180-41e1-9798-03f9a9757554.png?resizew=204)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ce0586aafd9bf4fb7e1be082624afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e60736d9decffeeb81479884779a4.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967752494538752/2971517476380672/STEM/48dfe7cd-2e8d-4252-88c2-a2a3f0832e7a.png?resizew=223)
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【推荐2】如图,四边形ABCD中,AB∥CD,AC平分∠BAD,CE∥AD交AB于E.
(1)求证:四边形AECD是菱形;
(2)若四边形AECD的周长为20,AC=8,求四边形AECD的面积.
(1)求证:四边形AECD是菱形;
(2)若四边形AECD的周长为20,AC=8,求四边形AECD的面积.
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515667057811456/2516140136906752/STEM/1aa72635c3c64d398e5c23884d317c96.png?resizew=139)
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名校
【推荐1】如图1,在平面直角坐标系中,抛物线
与x轴交于点A,B,与y轴交于点C,其中
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/83502fc5-b39d-475c-b4e4-3223dc37fbce.png?resizew=508)
(1)求B,C的坐标.
(2)如图2,点D是第一象限内抛物线上的动点,连接OD交BC于点E,当
的值最大时,求出此时点D的坐标并求出
的最大值.
(3)在(2)的条件下,将OD绕点O顺时针旋转90°得到线段
,若线段
与抛物线对称轴有公共点,直接写出点D的横坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51efb4ce63eb19b668daf687be7e99b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/83502fc5-b39d-475c-b4e4-3223dc37fbce.png?resizew=508)
(1)求B,C的坐标.
(2)如图2,点D是第一象限内抛物线上的动点,连接OD交BC于点E,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc2a5e65dc9b159fc6ff4d83319f89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc2a5e65dc9b159fc6ff4d83319f89e.png)
(3)在(2)的条件下,将OD绕点O顺时针旋转90°得到线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94765b7a91142b509b33df21798b0d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94765b7a91142b509b33df21798b0d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d6ab4479fca30268660739ec6852c3.png)
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【推荐2】如图,二次函数
的图象与
轴交于
,
两点,与
轴交于
点,其中
,
.
(1)求这个二次函数的表达式;
(2)在二次函数图象上是否存在点
,使得
?点
与点
不重合.若存在,请求出
点坐标;若不存在,请说明理由;
(3)点
是对称轴l上一点,当
是直角三角形时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/a3394ccc-f424-4845-aad9-16bb27754589.png?resizew=334)
(1)求这个二次函数的表达式;
(2)在二次函数图象上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22facb1082f02fdfe5319b9e9afa0b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bc4b926b29e58400df99ebf5771404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】如图,直线
交x轴于点B、y轴于点C,抛物线经过点B,点C,且过
,连接
,点P是第一象限内抛物线上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/38a2eeaf-856e-41cb-ae21-54aeef36231b.png?resizew=369)
(1)求此抛物线的表达式;
(2)动点P运动到什么位置时,
的面积最大?若存在,请求出符合条件的P点的坐标;若不存在,请说明理由;
(3)过点P作
轴,垂足为点M,
交
于点Q.试探究点P在运动过程中,是否存在这样的点Q,使得以A,C,Q为顶点的三角形是等腰三角形.若存在,请求出此时点P的坐标,若不存在,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eed46a589bde8b7c78a81a8cf9b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c6abf1c9bc89e3fb025aa9a8e9e4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/38a2eeaf-856e-41cb-ae21-54aeef36231b.png?resizew=369)
(1)求此抛物线的表达式;
(2)动点P运动到什么位置时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
(3)过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,已知抛物线
的图象与
轴交于
,
两点,与
轴交于点
,抛物线的对称轴与
轴交于点
.点
从
点出发,以每秒1个单位长度的速度向
运动,过
作
轴的垂线,交抛物线于点
,交
于
.
(1)求点
和点
的坐标;
(2)设当点
运动了
(秒
时,四边形
的面积为
,求
与
的函数关系式,并指出自变量
的取值范围;
(3)在线段
上是否存在点
,使得
成为以
为一腰的等腰三角形?若存在,求出点
的坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2491daca6e57922659ba528830f3fe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f7c674f87a67fde99afceb3cfd8189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc4a40291345c6991e554d7a414df72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2021/9/23/2814369304944640/2816304414040064/STEM/19280943e9d44bd486e2ba00e2979a29.png?resizew=282)
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