如图,已知二次函数
的图象经过点
和点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/7fb5b5ac-0d43-48de-90fa-2be30e07ba7a.png?resizew=126)
(1)求该二次函数的解析式;
(2)点
在该函数图象上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530a9976281288e0b1e1fb2601ebf18e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0638778c13f3308d5b93ecd995f7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6980cacedbef75cc2cbf76f6758b34f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/7fb5b5ac-0d43-48de-90fa-2be30e07ba7a.png?resizew=126)
(1)求该二次函数的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f63033e4be1d265c53ab0f16a22e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2024-03-07 23:19:56
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【推荐1】如图1,在平面直角坐标系
中,抛物线
:
经过点
和点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/4ea764c2-c9b6-4e3c-85e3-6da120bd472c.png?resizew=566)
(1)求抛物线
的解析式;
(2)如图2,作抛物线
,使它与抛物线
关于原点
成中心对称,请直接写出抛物线
的解析式;
(3)如图3,将(2)中抛物线
向上平移2个单位,得到抛物线
,抛物线
与抛物线
相交于
,
两点(点
在点
的左侧).
①求点
和点
的坐标;
②若点
,
分别为抛物线
和抛物线
上
,
之间的动点(点
,
与点
,
不重合),试求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/4ea764c2-c9b6-4e3c-85e3-6da120bd472c.png?resizew=566)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
(2)如图2,作抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(3)如图3,将(2)中抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5627dee61ff1a179ed56a7e627927448.png)
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【推荐2】如图,二次函数
图象与
轴交于A、B与
轴交于C,OA=2,OB=1 ,OC=4
(1).求二次函数解析式;
(2).若点D为抛物线的顶点,求△BCD的面积.
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
(1).求二次函数解析式;
(2).若点D为抛物线的顶点,求△BCD的面积.
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361931059036160/2362233924288512/STEM/90a3fa12d83b4f1980e803be973ed7b6.png?resizew=168)
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【推荐1】如图,抛物线
的图象与x轴交点为A和B,与y轴交点为
,与直线
交点为A和C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/66771073-798b-448f-b16e-94a0815e7d32.png?resizew=210)
(1)求抛物线的解析式;
(2)求点C的坐标,并结合函数图象直接写出当
时x的取值范围;
(3)若点E是x轴上一个动点,把点E向下平移4个单位长度得到点F,点F向右平移4个单位长度得到点G,点G向上平移4个单位长度得到点H,若四边形
与抛物线有公共点,请直接写出点E的横坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b081fba8461ecdbd6c14c8d97ea6be48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c95963e8e4dcc511f0d86b1853ddcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea60be89708e5416e6de8aa9857f2141.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/66771073-798b-448f-b16e-94a0815e7d32.png?resizew=210)
(1)求抛物线的解析式;
(2)求点C的坐标,并结合函数图象直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
(3)若点E是x轴上一个动点,把点E向下平移4个单位长度得到点F,点F向右平移4个单位长度得到点G,点G向上平移4个单位长度得到点H,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb359c7577a9c68966540657ea0d82e9.png)
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【推荐2】在平面直角坐标系
中,直线
与x轴交于点A,与抛物线
交于B,C两点(B在C的左边).
(2)如图1,若B点关于x轴的对称点为
点,当以点A,
,C为顶点的三角形是直角三角形时,求实数a的值;
(3)定义:将平面直角坐标系中横坐标与纵坐标均为整数的点叫作格点,如
,
等均为格点.如图2,直线l与抛物线E所围成的封闭图形即阴影部分(不包含边界)中的格点数恰好是26个,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07bedb3b15ab4238d0ac8dc6f215474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943f80e491722d4bd84819aad45e4463.png)
(2)如图1,若B点关于x轴的对称点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
(3)定义:将平面直角坐标系中横坐标与纵坐标均为整数的点叫作格点,如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f48e1c656aace41360467f254e359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
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【推荐3】对于某一自变量为x的函数,若当x=m时,其函数值也为m,称点(m,m)为此函数的不动点.现有二次函数y=x2+bx+c.
(1)若b=4,
①c=0,求函数y=x2+bx+c的不动点坐标;
②若二次函数y=x2+bx+c有两个不同的不动点,且这两个不动点的横坐标都小于1,则c的取值范围为 .
(2)若函数y=x2+bx+c图象上有两个关于原点对称的不动点A(x1,y1),B(x2,y2)(x1>x2),该图象与y轴交于C点,且△ABC是以AC为直角边的直角三角形,求点C的坐标.
(1)若b=4,
①c=0,求函数y=x2+bx+c的不动点坐标;
②若二次函数y=x2+bx+c有两个不同的不动点,且这两个不动点的横坐标都小于1,则c的取值范围为 .
(2)若函数y=x2+bx+c图象上有两个关于原点对称的不动点A(x1,y1),B(x2,y2)(x1>x2),该图象与y轴交于C点,且△ABC是以AC为直角边的直角三角形,求点C的坐标.
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