如图,在平面直角坐标系中,抛物线
与x轴交于
两点,与y轴交于点C.点D在抛物线上,且在第一象限.
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731232800882688/2732995089014784/STEM/72919fc1ed154ecc944d45930b218a0c.png?resizew=352)
(1)求
的值;
(2)如图1,过点D作
轴,求
的最大值;
(3)如图2,连接
,若
,求点D的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ab36b5a6a8376b45bb562e36fc085c.png)
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731232800882688/2732995089014784/STEM/72919fc1ed154ecc944d45930b218a0c.png?resizew=352)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
(2)如图1,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ce0af3851e1390e7c22e2aacce3a15.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c905599045694c50d401bfc78c394f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a1f9e83e2e640c3dedc67859bf0b69.png)
更新时间:2021-05-31 17:15:39
|
【知识点】 其他问题(二次函数综合)
相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】如图,已知抛物线
与x轴交于A、B两点,点C是抛物线在第一象限内部分的一个动点,点D是OC的中点,连接BD并延长,交AC于点E.
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/55471a6f-3ca0-438f-bd7c-5a4b8b8a7204.png)
(1)说明:
;
(2)当点C、点A到y轴距离相等时,求点E坐标.
(3)当
的面积为
时,求
的值.
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/7adb8c41ab624acfbf22992ed96321f9.png)
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/55471a6f-3ca0-438f-bd7c-5a4b8b8a7204.png)
(1)说明:
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/79ce8619977544b6bc26539673ffa47d.png)
(2)当点C、点A到y轴距离相等时,求点E坐标.
(3)当
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/5b383efa2f5b4f759ddd6b53a7650680.png)
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/cdda2d329f2e4dfab90fbb5688140460.png)
![](https://img.xkw.com/dksih/QBM/2014/3/24/1573716764991488/1573716771315712/STEM/fac4b04b1ecf487da82193b24cc36be5.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知抛物线
与x轴的负、正半轴分别交于A,B两点,与y轴的负半轴交于点D点C是抛物线的顶点.
(1)若
,求该抛物线的对称轴;
(2)在(1)的条件下,连接AD,CD,若
,求该抛物线的解析式;
(3)若
,点D的坐标为
,请判断点C是否存在最高点或最低点,若存在,求该点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5bd57912b194186fb5cbe63ed24861.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf64a6d2e4e816ff540beeecf8c331d.png)
(2)在(1)的条件下,连接AD,CD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af21bb000b6110ef1deea3635f6d0376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6a9e845bfe11b80ad41dbdbda857f9.png)
您最近一年使用:0次