如图,抛物线
经过
三点.点
是抛物线
段上一动点(不含端点
,
与
的延长线交于点
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247261698293760/2248633744728064/STEM/a408580b2dbc450fad1a1a0f0c7d908a.png?resizew=189)
(1)求抛物线的解析式.
(2)当
时,求点
的坐标.
(3)在(2)的条件下,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f917b3295f419ee090024213bf2305f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c27eda162792128da25f541303a3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5834eec7f21acb778f1d0282bdd52068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d5ff57f147aa0628fdd47899b5a132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247261698293760/2248633744728064/STEM/a408580b2dbc450fad1a1a0f0c7d908a.png?resizew=189)
(1)求抛物线的解析式.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在(2)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
更新时间:2019-07-17 09:19:58
|
【知识点】 面积问题(二次函数综合)
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】二次函数
的图象与x轴交于A、B两点,与y轴交于点C,自变量x与函数值y的部分对应取值如表:
(1)请选择你喜欢的方法求二次函数
表达式;
(2)如图1,点D为线段
的中点,点 E为线段
上任意一点,将线段
绕点D顺时针旋转
得到线段
,连接
.
①求
面积的最大值;
②直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | … | 2 | … | |||||
y | … | 0 | 0 | … |
(1)请选择你喜欢的方法求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)如图1,点D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7f8a812e8164cc7f2e4cfba0a406a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/61566594-3162-4c3e-a029-6852e48c728e.png?resizew=308)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc869125145c0139d92490a41bd3918.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b794583f1d7892bb4c34918539cb753e.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,在平面直角坐标系中,已知抛物线y=ax2+bx+8与x轴相交于A,B两点,与y轴相交于点C,OA=4,OB=2,点D是抛物线上一动点,且在y轴的左侧,连接AD,BC,AC,CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a7b4c1f4-398f-4d0a-8193-6761c10551bd.png?resizew=270)
(1)求抛物线的函数表达式;
(2)已知直线y=kx+8与x轴相交于点M(点M与点B不重合),若以点M,C,O为顶点的△MCO与△BCO相似,求k的值;
(3)连接OD,若△DAC的面积是△ABC的面积的
时,求△CDO的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a7b4c1f4-398f-4d0a-8193-6761c10551bd.png?resizew=270)
(1)求抛物线的函数表达式;
(2)已知直线y=kx+8与x轴相交于点M(点M与点B不重合),若以点M,C,O为顶点的△MCO与△BCO相似,求k的值;
(3)连接OD,若△DAC的面积是△ABC的面积的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d9c3457bb110ade51370f2eed4a0b3.png)
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