如图,已知抛物线
与x轴交于A、B两点,与y轴交于点C,若已知B点的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/21364a64-09f5-4cfa-b660-d7a50ed23fae.png?resizew=336)
(1)求抛物线的解析式及其对称轴;
(2)在此抛物线的对称轴上是否存在一点P,使得
的周长最小?若存在,请求出点P的坐标;若不存在,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcc62e5df574a96c4a763c4e88bdde2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1dae05f42110fde12a61fca98bc408.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/21364a64-09f5-4cfa-b660-d7a50ed23fae.png?resizew=336)
(1)求抛物线的解析式及其对称轴;
(2)在此抛物线的对称轴上是否存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
更新时间:2024-03-10 00:08:51
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【推荐1】如图,在平面直角坐标系中,直线
与y轴交于点A,与x轴交于点B,抛物线
过A、B两点.
(2)过点A作
平行于x轴,抛物线于点C,点F为抛物线上一动点(点F在
上方),作
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于点D.问当点F在何位置时,四边形
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(3)当
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的最大值为4,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
(2)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17064fbff0ecc9dffaf47c8c39319e91.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba473d8259b0d54c0bc617d07aea6cd.png)
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【推荐2】已知抛物线
经过坐标原点O,与x轴交于另一点A,顶点为B.求:
(1)抛物线的解析式;
(2)
的面积;
(3)自变量x满足
时,函数y的最小值是
,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e083c0108402934ae2ad6b22f88644aa.png)
(1)抛物线的解析式;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(3)自变量x满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32dafa09346e8a6af1e994b8f2d6212b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
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【推荐1】已知抛物线
交x轴于点
和点
,交y轴于点C.
(1)求抛物线的解析式;
(2)如图,点P是抛物线上位于直线
下方的动点,过点P分别作x轴、y轴的平行线,交直线
于点D,交x轴于点E,当
取最大值时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc381ec69d507f6f2181df98c3888ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f5353818d0e41d51657a7d9655021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8760ff28f93b72775f3eec1f87f9d686.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/28/3f5ff536-84ae-4537-867d-00fd82db7ebf.png?resizew=201)
(1)求抛物线的解析式;
(2)如图,点P是抛物线上位于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f3a30d63fde5623d018b4a77231967.png)
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【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于点
和点
,与
轴交于点
,点
是直线
上方的抛物线上一点(点
不与点B,C重合),过点
作
轴交直线
于点
.
(2)求线段
长的最大值;
(3)连接
,请直接写出四边形
的面积最大值为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd99c5000629d7f49499d666e68f40d.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/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b32f59522eea44b24cdd4c2bc0406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603b16b76b16fb91415772cb2b773f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76981622e3684aca12435743b6a08a8c.png)
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