如图,抛物线
与x轴交于点A和点
,与y轴交于点
,点E在抛物线上
(2)点E在第一象限内,过点E作
轴,交
于点F,作
轴,交抛物线于点H,点H在点E的左侧,以线段
为邻边作矩形
,当矩形
的周长为11时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7641baffd700f0c577d001e9d7a6c20.png)
(2)点E在第一象限内,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627026bcc48e88384717f3d2fea54582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc1cf63cbf9a3455c7769b15af5445b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb1f676b3e7ef6432b3584ef557f19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
更新时间:2024-04-17 14:36:09
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【推荐1】如图,抛物线y=ax2+bx+c经过A(﹣1,0)、B(4,0)、C(0,3)三点,D为直线BC上方抛物线上一动点,DE⊥BC于点E.
(1)求抛物线的函数表达式;
(2)求线段DE长度的最大值.
(1)求抛物线的函数表达式;
(2)求线段DE长度的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/82e857a6-afb4-42d5-8489-502c0a5631ec.png?resizew=157)
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【推荐2】已知点
和
在二次函数
(
、
是常数,
)的图像上.
(1)若
,求
、
的值;
(2)若二次函数
(
、
是常数,
)的图像向下平移
个单位后,仍与
轴有两个交点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】在平面直角坐标系xOy中,直线l:y=﹣2x+n与抛物线y=mx2﹣4mx﹣2m﹣3相交于点A(﹣2,7).
(1)求该直线与抛物线的解析式;
(2)过点A作AB∥x轴交抛物线于点B,设抛物线与x轴交于点C、D(点C在点D的左侧),求△BCD的面积;
(3)点E(t,0)为x轴上一个动点,过点E作平行于y轴的直线与直线l和抛物线分别交于点P、Q.当点P在点Q上方时,求线段PQ的最大值.
(1)求该直线与抛物线的解析式;
(2)过点A作AB∥x轴交抛物线于点B,设抛物线与x轴交于点C、D(点C在点D的左侧),求△BCD的面积;
(3)点E(t,0)为x轴上一个动点,过点E作平行于y轴的直线与直线l和抛物线分别交于点P、Q.当点P在点Q上方时,求线段PQ的最大值.
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852309314445312/2854646151364608/STEM/5c27f306-ac83-40a3-bce3-960cb7095f0f.png?resizew=333)
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【推荐2】如图,在平面直角坐标系中,已知点A坐标为
,直线
与x轴相交于点B,连结
,抛物线
从点O沿
方向平移,与直线
交于点P,顶点M到A点时停止移动.
所在直线的函数解析式;
(2)设抛物线顶点M的横坐标为m,当m为何值时,线段
最短;
(3)当线段
最短时,相应的抛物线上是否存在点Q,使
的面积与
的面积相等,若存在,请求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e194aba3710705f9c8c68cbc3e7af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)设抛物线顶点M的横坐标为m,当m为何值时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(3)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460411e4fe0967a07f58dae7feb01136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35a9ec7088381262f8ca327bd377660.png)
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