如图,已知抛物线y=x2+bx+c与x轴交于A、B两点(A点在B点左侧),与y轴交于点C(0,-3),对称轴是直线x=1,直线BC与抛物线的对称轴交于点D.
(1)求抛物线的函数表达式;
(2)求直线BC的函数表达式;
(3)点E为y轴上一动点,CE的垂直平分线交CE于点F,交抛物线于P、Q两点,且点P在第三象限.
①当线段PQ=
AB时,求tan∠CED的值;
②当以点C、D、E为顶点的三角形是直角三角形时,请直接写出点P的坐标.
(1)求抛物线的函数表达式;
(2)求直线BC的函数表达式;
(3)点E为y轴上一动点,CE的垂直平分线交CE于点F,交抛物线于P、Q两点,且点P在第三象限.
①当线段PQ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d78f02558d84c57e7db6d9c0221ba.png)
②当以点C、D、E为顶点的三角形是直角三角形时,请直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/2011/7/7/1573221818458112/null/STEM/adc54bd8adbd4c78b4734f6777df4bf5.png?resizew=311)
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更新时间:2016-12-05 03:10:59
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【推荐1】如图,抛物线
与
轴交于点
,顶点为
,动点
在抛物线对称轴上,点
在对称轴右侧 抛物线上,点
在
轴正半轴 上,且
, 连接
得四边形
.
![](https://img.xkw.com/dksih/QBM/2017/3/10/1640869363810304/1643851644231680/STEM/bf91008a6d8149c5addb9efd50cf8a6d.png?resizew=169)
(1)求
点坐标;
(2)当
时,显然满足条件的四边形有两个,求出相应的点
的坐标;
(3)当
时,对于每一个确定的
值,满足条件的四边形
有两个,当这两个四边形的面积之比为1:2时,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab2fe78d4cfc053b67dc299929d7ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9cda46e575acf64941ea0964b89ee99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5994aaaa73dc692e71f5ff6d0ce33f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b166a1e52fe1c23656666a0504d0bd22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6965c9dd3c507e4ccada546704d65324.png)
![](https://img.xkw.com/dksih/QBM/2017/3/10/1640869363810304/1643851644231680/STEM/bf91008a6d8149c5addb9efd50cf8a6d.png?resizew=169)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e4c4401486f8a81076019f162115b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b85fc62cc587bc06390e9a30d2752c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772abfbcb0ffe7ec44efd90789c01b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6965c9dd3c507e4ccada546704d65324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772abfbcb0ffe7ec44efd90789c01b42.png)
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名校
【推荐2】如图,半圆O的直径
,在
中,
,
,
,半圆O以
的速度从左向右运动,在运动过程中,点D、E始终在直线BC上,设运动时间为
,当
时,半圆O在
的左侧,
.
如图1当
时,圆心O到AB所在直线的距离是______cm.
当t为何值时,
的边AB所在的直线与半圆O所在圆相切?求时间t.
如图2,线段AB的中点为F,求圆心O与B、F两点构成以BF为腰的等腰三角形时运动的时间t.
在图2的基础上,建立如图所示的平面直角坐标系,四边形ACBG是矩形,如图3,半圆O向右运动的同时矩形也向右运动,速度为
,问经过多长时间O、F、G在同一条直线上,求时间
并求出此时DG的直线解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8759308ad22c3c55da1f08285806fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13d71a5e5e491a8c54fccc405b35ed06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba196286c8296487cb226813f37949ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b4aeff692cbd1ef60e6d562dd6496d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f051275aa34c90fd6957973f6640753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d12c2cda2461b98d9e416249dea788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269a05880d03b9af01aaf2579f36e6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b38f7849681e9ba6d897ea9df0cc9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9a1f6a5a629535f9e2852fcb066cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e636bddc1a3d7c006ac304e96cd2551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66f7668d38373b8e824b6fd988b4333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9a5a2656fb7aa862541cc52575aa9e.png)
![](https://img.xkw.com/dksih/QBM/2019/4/7/2177284776714240/2178878104322048/STEM/67b43f4246af4850a6c4842db35e5c22.png?resizew=422)
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【推荐1】有三个函数,对于同一个自变量x,对应的函数值分别为
,若恰好有
,则称y为
的“中值函数”.
(1)若
的图像为直线,
的图像是抛物线,则它们的中值函数的图像为( )
A.直线 B.抛物线 C.双曲线 D.以上答案均错
(2)若
、它们的中值函数为
,
①若点P在
、
和它们的中值函数图像上,则点P的坐标为_________.
②在如图中,画出上述中值函数的大致图象.并根据图象写出这个中值函数的两条性质;
![](https://img.xkw.com/dksih/QBM/2019/12/9/2351061616386048/2351615973359616/STEM/67ddbef296b045c5bc1e4050ac3afa3f.png?resizew=98)
性质1:_______________________________;
性质2:_______________________________;
③利用中值函数的性质说明:面积为1的长方形,当该长方形长与宽相等时,周长最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde222d54aa51244b1ff0d8d28be86ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08bba437f22c65738aee593bb8e11ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7404d4aa0f0bcfe7ebf45d3eeab3cdb6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
A.直线 B.抛物线 C.双曲线 D.以上答案均错
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabed1e1d48e98301cb4b96eba0bdc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae297a79f23e7988f029b9ba9713e1.png)
①若点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
②在如图中,画出上述中值函数的大致图象.并根据图象写出这个中值函数的两条性质;
![](https://img.xkw.com/dksih/QBM/2019/12/9/2351061616386048/2351615973359616/STEM/67ddbef296b045c5bc1e4050ac3afa3f.png?resizew=98)
性质1:_______________________________;
性质2:_______________________________;
③利用中值函数的性质说明:面积为1的长方形,当该长方形长与宽相等时,周长最小.
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【推荐2】数形结合是研究数学问题的有效途径和重要策略,它体现了数学的和谐美,统一美.阅读例题解题过程,解答提出的问题.
例题:已知函数
,
(
为常数,
为实数).若方程
有两个不相等的实数根,求
的取值范围.
解:画出函数
的图像,图像是一条折线,
,
两函数图像的交点的横坐标就是方程
的根.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/0240bf5c-b975-4e86-be75-1b599d806924.png?resizew=191)
(1)若
时,两图像无交点或只有一个交点,显然
无解或有一解;
(2)若
时,当直线
平行于射线
时
.
所以当
时,直线
与
,
有两个交点,故有两根,所以
的范围
.
问题:若方程
有四个不相等的实数根,求
的取值范围.
例题:已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a05df8edae997c5ab235e54755ed33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96ede008c067ce4bc534f35b0cf915d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
解:画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a05df8edae997c5ab235e54755ed33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4309cc517da10cf325b0003e50d8da.png)
两函数图像的交点的横坐标就是方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/0240bf5c-b975-4e86-be75-1b599d806924.png?resizew=191)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a4eaa80b44625890339d6a0065c241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351ce9a5502d6c9da885457289ebfb61.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4b47ca256feb6bf1cf1758866ad90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
所以当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffbb4e6b92463a41bd9460dac6b1ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bfc507dd0adbe927aae3cc643bbd5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffbb4e6b92463a41bd9460dac6b1ca7.png)
问题:若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a173561b1d6c141ccd3a9f4c4ee4db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】我们约定:在平面直角坐标系中,若某函数图象上至少存在不同的两点关于y轴对称,则把该函数称之为“T函数”,其图象上关于y轴对称的不同两点叫做一对“T点”.根据该约定,完成下列各题.
(1)若点
与点
是关于x的“T函数”
的图象上的一对“T点”,则
______,
______,
______;
(2)若关于x的“T函数”
(
,且a,b,c是常数)经过坐标原点O,且与直线
(
,
,且m,n是常数)交于
,
两点,当
,
满足
时,直线l是否总经过某一定点?若经过某一定点,求出该定点的坐标;否则,请说明理由.
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93b9ce0335dbfcc5b363b410b7086e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e47dd8c389c46f61dac9688354809e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaf1d52ea2811a3fd4960f49d8eaea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c7e7449010436e00dce3b6924a4258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(2)若关于x的“T函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7d436bb96d03f111de6850cf2c7965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba1e1ca5040060dde64c667ec432a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f05eb4c4c6f9e6a702735bc0b5122d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3aeb9541fcf2a276bc028d67851009.png)
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