已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a077df8660bb95c530478854f44255.png)
(1)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096cc1427d402d3b470d066c9cf8f536.png)
①求该二次函数图象的顶点坐标;
②定义:对于二次函数
,满足方程
的
的值叫做该二次函数的“不动点”.
求证:二次函数
有两个不同的“不动点”.
(2)设
,如图所示,在平面直角坐标系
中,二次函数
的图象与
轴分别相交于不同的两点
,其中
,
,与
轴相交于点
,连结
,点
在
轴的正半轴上,且
,又点
的坐标为
,过点
作垂直于
轴的直线与直线
相交于点
,满足
.
的延长线与
的延长线相交于点
,若
,求二次函数的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a077df8660bb95c530478854f44255.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096cc1427d402d3b470d066c9cf8f536.png)
①求该二次函数图象的顶点坐标;
②定义:对于二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6774996afcff7db941d1f284b9c7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
求证:二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d718c44dc058eb350322e60b95c47b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a9e1eb4c3226489d1344321b10b7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f55d2847b4e6b32ab40b46bdd6d1cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a4e0d114afe36b3ad5eaac27ddee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fe3251e054fe97089806ba7033f802.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0a7f9ee3c6ccaea8dd3d5ad042e5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de519cab8b450befd70278952ed17914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.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/1ce278aa1b6ea57845f899bb4abc0606.png)
![](https://img.xkw.com/dksih/QBM/2019/7/18/2249590156967936/2249700647993344/STEM/4b76cf5d6e7e4c79a5355ac4929ef039.png?resizew=247)
更新时间:2019-07-18 21:30:35
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】(1)如图1,在正方形
中,点
是线段
延长线上的一个动点,连接
,过点
作
交射线
于点
.则
与
之间的数量关系是 ;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/4e0748a5-751d-468e-939d-da7d5b0bbe26.png?resizew=343)
(2)若将(1)中的正方形改为矩形,如图2,矩形
中,
,点
是线段
延长线上的一个动点,连接
,过点
作
交射线
于点
.试判断
与
之间的数量关系,写出结论并证明;(用含
的式子表示)
(3)如图2,在矩形
中,若
,连接
交
于点
,连接
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ed934aa29859e93b1f758229a12581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/4e0748a5-751d-468e-939d-da7d5b0bbe26.png?resizew=343)
(2)若将(1)中的正方形改为矩形,如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f9c0c60fd81a5b060e7c0898a28d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ed934aa29859e93b1f758229a12581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585288e61871608f6ff8f7e4a0beafbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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解答题-问答题
|
较难
(0.4)
真题
解题方法
【推荐2】如图,抛物线y=
x2+bx+c与直线y=
x+3交于A,B两点,交x轴于C、D两点,连接AC、BC,已知A(0,3),C(﹣3,0).
(1)求抛物线的解析式;
(2)在抛物线对称轴l上找一点M,使|MB﹣MD|的值最大,并求出这个最大值;
(3)点P为y轴右侧抛物线上一动点,连接PA,过点P作PQ⊥PA交y轴于点Q,问:是否存在点P使得以A,P,Q为顶点的三角形与△ABC相似?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/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求抛物线的解析式;
(2)在抛物线对称轴l上找一点M,使|MB﹣MD|的值最大,并求出这个最大值;
(3)点P为y轴右侧抛物线上一动点,连接PA,过点P作PQ⊥PA交y轴于点Q,问:是否存在点P使得以A,P,Q为顶点的三角形与△ABC相似?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://img.xkw.com/dksih/QBM/2018/7/18/1991225906757632/1996854552895488/STEM/b885c460c6b4485a8d8558518f10b296.png?resizew=121)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,已知抛物线
(
,
,
为常数,
)交
轴于
、
两点,交
轴于
,将该抛物线位于直线
(
为常数,
)下方的部分沿直线
翻折,其余部分不变,得到的新图像记为“图像
”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/3b9d70ac-7cbe-4903-91ec-3c103c8608cd.png?resizew=132)
(1)求该抛物线的解析式;
(2)若
时,直线
与图像
有三个交点,求
的值;
(3)若直线
与图像
有四个交点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee6f55f5de53781cc0e1c61f9fc5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7480deb6fedddf1fb05d8cdb24be1703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c43f704b5d150cb4e29e9796a07d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be466586da8810ccfd811c59a747adb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/3b9d70ac-7cbe-4903-91ec-3c103c8608cd.png?resizew=132)
(1)求该抛物线的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5848d7371b15965ab8990329fe04bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐2】已知抛物线
向右平移2个单位,再向下平移3个单位后恰好经过点
.
(1)求平移后抛物线的解析式;
(2)点A在平移后物线上,点A在该抛物线对称轴的右侧,将点A绕着原点逆时针旋转90°得到点B,设点A的横坐标为t;
①用t表示点B的坐标;
②若直线
,且
与平移后抛物线只有一个交点C,当点
到直线AC距离取得最大值时,此时直线AC解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d04bcdc75d04cd200f21f1412f42b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d25e70d37af93796965efc8d342185.png)
(1)求平移后抛物线的解析式;
(2)点A在平移后物线上,点A在该抛物线对称轴的右侧,将点A绕着原点逆时针旋转90°得到点B,设点A的横坐标为t;
①用t表示点B的坐标;
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0d262cf5dacc3c7b0628f58df8e0ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ad835d6034567e028f4080a87ba939.png)
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