如图是二次函数y=ax2+bx+c(a≠0)的部分图像,其中点A(-1,0)是x轴上的一个交点,点C是y轴上的交点.
(1)若过点A的直线l与这个二次函数的图像的另一个交点为D,与该图像的对称轴交于点E,与y轴交于点F,且DE=EF=FA.
①求
的值;
②设这个二次函数图像的顶点为P,问:以DF为直径的圆能否经过点P?若能,请求出此时二次函数的关系式;若不能,请说明理由.
(2)若点C坐标为(0,-1),设S=a+b+c ,求S的取值范围.
(1)若过点A的直线l与这个二次函数的图像的另一个交点为D,与该图像的对称轴交于点E,与y轴交于点F,且DE=EF=FA.
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8b149c77afb7708292c8773cc84fe.png)
②设这个二次函数图像的顶点为P,问:以DF为直径的圆能否经过点P?若能,请求出此时二次函数的关系式;若不能,请说明理由.
(2)若点C坐标为(0,-1),设S=a+b+c ,求S的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/3/27/1911378128371712/1916238444421120/STEM/01969768d99d49b5b6fa28f33422c6e6.png?resizew=228)
更新时间:2018-04-03 18:20:00
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【知识点】 其他问题(二次函数综合)
相似题推荐
【推荐1】我们定义【a,b,c】为函数
的“特征数”,如:函数
的“特征数”是【2,-3,5】,函数y=x+2的“特征数”是【0,1,2】,函数y=-2x的“特征数”是【0,-2,0】.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/693b5e69-8a77-47cf-a1f4-bcb8a09a71e3.png?resizew=216)
(1)若一个函数的特征数是【1,-4,1】,将此函数的图象先向左平移2个单位,再向上平移1个单位,得到一个图象对应的函数“特征数”是______.
(2)将“特征数”是【0,-
,-1】的函数图象向上平移2个单位,得到一个新函数,这个新函数的解析式是______.
(3)在(2)中,平移前后的两个函数图象分别与y轴交于A、B两点,与直线x=-
分别交于D、C两点,在给出的平面直角坐标系中画出图形,并判断以A、B、C、D四点为顶点的四边形的形状,且说明理由;
(4)若(3)中的四边形与“特征数”是【1,-2b,
】的函数图象有交点,求满足条件的实数b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031074c021f3bd60f9bf55a9d05046cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/693b5e69-8a77-47cf-a1f4-bcb8a09a71e3.png?resizew=216)
(1)若一个函数的特征数是【1,-4,1】,将此函数的图象先向左平移2个单位,再向上平移1个单位,得到一个图象对应的函数“特征数”是______.
(2)将“特征数”是【0,-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
(3)在(2)中,平移前后的两个函数图象分别与y轴交于A、B两点,与直线x=-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(4)若(3)中的四边形与“特征数”是【1,-2b,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6730fa7237337ed897424c02399b67c.png)
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【推荐2】如图,
是线段
上--动点,以
为直径作半圆,过点
作
交半圆于点
,连接
.已知
,设
两点间的距离为
,
的面积为
.(当点
与点
或点
重合时,
的值为
)请根据学习函数的经验,对函数
随自变量
的变化而变化的规律进行探究. (注: 本题所有数值均保留一位小数)
通过画图、测量、计算,得到了
与
的几组值,如下表:
补全表格中的数值:
;
;
.
根据表中数值,继续描出
中剩余的三个点
,画出该函数的图象并写出这个函数的一条性质;
结合函数图象,直接写出当
的面积等于
时,
的长度约为___ _
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbc372e97cd951e911f4f998ec5e829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19f6c71e82001bb106b6f1389046b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0e3edc86f777c300ae57599b27e492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9c5c7cffee04e1a5545ea43e6f0f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a416e351c08669214734418cf60209e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17c7113ecb38f2e75246ae58ad0f672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/c5b3e65f-873c-48a2-a8d1-d37ba4249984.png?resizew=450)
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【推荐3】对于平面图形
、
和直线
(这里k、b均为常数),若它们同时满足以下两个条件:
a.对
上任意一点
,均有
;
b.对
上任意一点
,均有
.
则称直线
是图形
、
的“分界线”.
回答以下问题.
(1)如图1所示,在平面直角坐标系中有正方形
和三角形
.例如:直线
是正方形
和三角形
的一条“分界线”.
(i)在下列直线中,可以作为正方形
和三角形
的“分界线”的是 (填选项的标号);
①
;②
;③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7090adf670566a2d7ce5903924d72f.png)
(ii)若直线
是正方形
和三角形
的“分界线”,结合图形,求k的取值范围.
(2)如图2所示,在平面直角坐标系中有抛物线
和正方形
,正方形
的顶点H的坐标为
.若直线
是抛物线M和正方形
的“分界线”,直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
a.对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e552dbaa7a6fa2cb732525f427e992dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865a480f34b66c3f08a33db760bf2e61.png)
b.对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0bf9a4c4641224bd5b8eff73bdeb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d987ebeefb6b0b35da78686330261a.png)
则称直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/f8f07992-59b7-4197-89b3-d290da484a00.png?resizew=452)
回答以下问题.
(1)如图1所示,在平面直角坐标系中有正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1d8d5cea065075fe50706abe3ae802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
(i)在下列直线中,可以作为正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a9b769d70cb6f29e965c800921c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7090adf670566a2d7ce5903924d72f.png)
(ii)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6767830cc1811f0f4ea5a008fdc7e723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
(2)如图2所示,在平面直角坐标系中有抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54f8621f08b5ac216c701f0d0326dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a42b2cc13fc294a6b7ff1cc8d1b1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a42b2cc13fc294a6b7ff1cc8d1b1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8bb89191a0501762486bda9efa3ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f590ca2bde213675bffe68ed4017f957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a42b2cc13fc294a6b7ff1cc8d1b1b7.png)
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