如图,抛物线
的图象经过点
,交
轴于点A,B (点A在点B左侧),连接
直线
与
轴交于点D,与
上方的抛物线交于点E与
交于点F.
(2)
是否存在最大值?若存在,请求出其最大值及此时点E的坐标;若不存在,请说明理由.
(3)第一象限内抛物线上是否存在一点P,使得
中有一个锐角与
相等?若存在,求点P得横坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225d7d9fce04567a066c713bf546d63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7720309624a5e413f5e612bd492effe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199247dcd4dbb1e552d8b3b78218ff6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1038936f515962f6f9e4b73032937dca.png)
(3)第一象限内抛物线上是否存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff36ac07c45c8d03cf3b7d8739c517ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6e28b762146ba4acf00df5c247dfe6.png)
更新时间:2024-04-13 12:04:30
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】在平面直角坐标系
中,已知抛物线L与x轴交于
两点,且经过点
,抛物线的顶点D的坐标为
.
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728475491205120/2741334570745856/STEM/640b98c7-dbed-43a4-9fab-bf746c1001d8.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728475491205120/2741334570745856/STEM/2a62e205-a9cd-4e5c-a248-d6529fb9ed43.png)
(1)求抛物线L的函数表达式;
(2)如图1,点E为第四象限抛物线L上一动点,过点E作
于点G,求
的最大值,及此时点E的坐标;
(3)如图2,连接
,过点O作直线
,点
分别为直线l和抛物线L上的点.试探究:在第一象限是否存在这样的点
,使
.若存在,请求出所有符合条件的点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d6e498b0c1d1cedb86fe548f9fe79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24afecf02b596fc3ab4f0be27b98a3d9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728475491205120/2741334570745856/STEM/640b98c7-dbed-43a4-9fab-bf746c1001d8.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728475491205120/2741334570745856/STEM/2a62e205-a9cd-4e5c-a248-d6529fb9ed43.png)
(1)求抛物线L的函数表达式;
(2)如图1,点E为第四象限抛物线L上一动点,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c13ab7f17263c4e6163d960f1c5060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ee6c7e0dfe134561f818cb51eebe09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069d263b434d3f3abcfd6d3ebd71fb8f.png)
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【推荐2】如图,抛物线
过A(4,0),B(1,3)两点,连结AB.
(1)分别写出抛物线的解析式 ,直线AB的解析式 ;
(2)点P在抛物线上,且位于第四象限,当△ABP的面积为6时,求出点P的坐标;
(3)若点P是抛物线上的一个动点(不与A、B重合),其横坐标为
,当△ABP的面积S随
的增大而增大时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9235b5c7d1983be560abf4fc4567dbc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/5f672892-3720-48c1-83ab-d985d516c82d.png?resizew=154)
(1)分别写出抛物线的解析式 ,直线AB的解析式 ;
(2)点P在抛物线上,且位于第四象限,当△ABP的面积为6时,求出点P的坐标;
(3)若点P是抛物线上的一个动点(不与A、B重合),其横坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解题方法
【推荐1】在△ABC中,∠ACB=90°,CD为高,BC=nAC
(1)如图1,当n=
时,则
的值为 ;(直接写出结果)
(2)如图2,点P是BC的中点,过点P作PF⊥AP交AB于F,求
的值;(用含n的代数式表示)
(3)在(2)的条件下,若PF=BF,则n= .(直接写出结果)
(1)如图1,当n=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c163a189c44fd9e9234bedd4dd96625c.png)
(2)如图2,点P是BC的中点,过点P作PF⊥AP交AB于F,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4821eec9eb06107b9297db207544d62a.png)
(3)在(2)的条件下,若PF=BF,则n= .(直接写出结果)
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448147104030720/2448288482705408/STEM/a2b24afc6ef04d40bd27c7a9166fdb52.png?resizew=363)
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【推荐2】(1)【发现】如图1,正方形
的边长为4,点 E为
中点.连接
.将
绕点 A 顺时针旋转
至
连接
交
于点 G.爱思考的小明做了这样的辅助线,过点E作
,交
于点 H……请沿着小明的思路思考下去,则
(2)【应用】如图2,菱形
的边长为3,且
,连接
,点E为
上一点,连接
.将
绕点A顺时针旋转
至
,连接
交
于点G,若
,求
的值;
(3)【拓展】如图3,在四边形
中,
,且
.点E为
上一点,连接
.将
绕点A顺时针旋转
至
,连接
交
于点C,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7cefa14a90337bbbb6e378d8a892d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6f01ec206c78418ffda81000c30a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228f7adccf6e6fdc7f0118d0c34de71b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66826633b4ddf985ae9bce79b745dde.png)
(2)【应用】如图2,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7cefa14a90337bbbb6e378d8a892d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a549b7be155b885691852622300b6e4.png)
(3)【拓展】如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7cefa14a90337bbbb6e378d8a892d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d906dbcfb261ea751664c0ab02322ee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84288b493b64c3a30466fb9075621da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cdd851d8bbbeb519bad324373cbe2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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【推荐1】
和
都是等边三角形,连接
,F,G,H分别是
,
,
的中点,连接
,
,
,
.
(1)如图1,当点B,C,D在一条直线上时,线段
与
的数量关系为___________,
___________°.
(2)当
绕顶点C逆时针旋转到如图2所示的位置时,(1)中的结论是否仍然成立?若成立,请说明理由;若不成立,请写出新的结论并证明.
(3)已知
的边长为
,
的边长为2,在
由图1的位置绕点C逆时针旋转一周的过程中,当
时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/a61dc788-f2b8-45f0-b8d7-812d358dad75.png?resizew=600)
(1)如图1,当点B,C,D在一条直线上时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64de9f9a290cd29d59e199022532afd2.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a93d5b1395e1156f5505f9c47120781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
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名校
【推荐2】【问题提出】
(1)如图①,在
中,点D在边
上,
,且
,则
;
【问题探究】
(2)如图②,在
中,
,
,求出
面积的最大值;
【问题解决】
(3)如图③,某市政中心计划由旧城改造出一块三角形空地
,并拟定在
中建一个户外健身区,其占地平面示意图为四边形
,其中D为
上一个三等分点(
),过点D分别作
,
,且点
分别在
上.经过实地测量后得知:
,
m,现要求户外健身区所在四边形
的面积最大,请你计算出户外健身区(即四边形
)所占面积最大为多少?
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3d1db9cc3489abef72ef8f4021fca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb080c5137fc9fc87dc4eb469b3b0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
【问题探究】
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1ac2dff9763044e787ebe877b4a142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac28300251806a2f96c7bbd442eda1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【问题解决】
(3)如图③,某市政中心计划由旧城改造出一块三角形空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5393d48a6bfdd3d11efdd031949f5a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cad97dd9d9593fa01342550aba6ec47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242b88a92c3f78aab24d2cc6944c53ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae1210a744ae636419de68a525faf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1643b281519e36d31edc451ccd17f93e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854015efbf5f226c9e09787782a7a800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/d7f48182-27d8-4cd3-87d9-de02d829ca77.png?resizew=623)
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【推荐1】如图,抛物线顶点A的坐标为(1,4),抛物线与x轴相交于B、C两点,与y轴交于点E(0,3).
(1)求抛物线的表达式;
(2)已知点F(0,﹣3),在抛物线的对称轴上是否存在一点G,使得EG+FG最小,如果存在,求出点G的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/be16df7c-f667-4c1b-8b7f-b8affaf2688c.png?resizew=132)
(1)求抛物线的表达式;
(2)已知点F(0,﹣3),在抛物线的对称轴上是否存在一点G,使得EG+FG最小,如果存在,求出点G的坐标;如果不存在,请说明理由.
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,在平面直角坐标系xOy中,抛物线
与x轴负半轴交于点A,顶点为B,且对称轴与x轴交于点C.
(1)求点B的坐标(用含m的代数式表示);
(2)D为BD中点,直线AD交y轴于E,若点E的坐标为(0,2),求抛物线的解析式;
(3)在(2)的条件下,点M在直线BO上,且使得△AMC的周长最小,P在抛物线上,Q在直线BC上,若以A、M、P、Q为顶点的四边形是平行四边形,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2017/6/12/1707386713735168/1708792833277952/STEM/208e0a69a9654bd69db820eae32139ac.png?resizew=96)
(1)求点B的坐标(用含m的代数式表示);
(2)D为BD中点,直线AD交y轴于E,若点E的坐标为(0,2),求抛物线的解析式;
(3)在(2)的条件下,点M在直线BO上,且使得△AMC的周长最小,P在抛物线上,Q在直线BC上,若以A、M、P、Q为顶点的四边形是平行四边形,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2017/6/12/1707386713735168/1708792833277952/STEM/bdc56663bc974becaeabe0f51787d3f5.png?resizew=301)
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解答题-证明题
|
较难
(0.4)
真题
【推荐3】一次函数
的图像与
轴交于点
,二次函数
的图像经过点
、原点
和一次函数
图像上的点
.
(2)如图1,一次函数
与二次函数
的图像交于点
、
(
),过点
作直线
轴于点
,过点
作直线
轴,过点
作
于点
.
①
_________,
_________(分别用含
的代数式表示);
②证明:
;
(3)如图2,二次函数
的图像是由二次函数
的图像平移后得到的,且与一次函数
的图像交于点
、
(点
在点
的左侧),过点
作直线
轴,过点
作直线
轴,设平移后点
、
的对应点分别为
、
,过点
作
于点
,过点
作
于点
.
①
与
相等吗?请说明你的理由;
②若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.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/20cc6de24c9f456f41c15f609fe2c2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c737c338e7cc50df74811f9670ebc19f.png)
(2)如图1,一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4678f9dc186372fe5dbda330af2c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cc6de24c9f456f41c15f609fe2c2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6e9099f58388fa3403cb3cf9428733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e688a289023149612113376278352af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dd42188ae3b66affd240183dd395c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15ebdaa4b3e74f75ae6f2d3cdf9b6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536bd40ed94807f7b401365cda2a22b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e92f14fb20f920f88dcad2ccd1d53f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dad5a12f34bed0da0de93beae0eaa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(3)如图2,二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea34e5e15852aef31b0b4c15b2480d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cc6de24c9f456f41c15f609fe2c2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e3e144dcd38926906a9fad1a2b6826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5b90f87babdcc49f25a3aaddb81bcc.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad30218a47e24ed822a75c62a3cb9968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be5cb6c4965698167aca907322a2da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42198b8e646ccfbbec323fd364c4d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba25c398b41939559a52518e8b251af6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d032d4b0d41ef531f4ed08a3cd027f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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