如图,抛物线
与
轴交于
,
两点
在
的左侧),与
轴交于点
,点
与
关于抛物线的对称轴对称.
(1)求抛物线的解析式及点
的坐标;
(2)点
是抛物线上的一点,当
的面积是8,求出点
的坐标;
(3)过直线
下方的抛物线上一点
作
轴的平行线,与直线
交于点
,已知
点的横坐标是
,试用含
的式子表示
的长及△ADM的面积
,并求当
的长最大时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4c35ba9d9fad6241559ff1ce118f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/9db7bd6f151534875f9602ca245c8f01.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/da5abc4464f8c0424a6c896617321757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/b8300269-b5a7-4cd8-991d-bc04526ac233.png?resizew=164)
(1)求抛物线的解析式及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2694c32ca1e120e988012b7ecd74f625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)过直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
19-20九年级上·湖北宜昌·期中 查看更多[4]
湖北省宜昌市东部2019-2020学年九年级上学期期中数学试题山东省德州市德城区2019-2020学年九年级上学期期末数学试题人教版2020年九年级上数学 22.1.3 二次函数 的图象和性质 课时3 二次函数 的图象和性质(已下线)专题2.11 二次函数y=a(x-h)2+k(a≠0)的图像与性质(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)
更新时间:2020-01-09 16:58:53
|
【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)
解题方法
【推荐1】如图,直线y=
与x轴,y轴分别交于A,C两点,二次函数
的图象与x轴交于点B,且AC=BC,点D为该二次函数图象上一点,四边形ABCD为平行四边形.
(1)求该二次函数的表达式;
(2)动点M沿线段CD从C到D,同时动点N沿线段AC从A到C都以每秒1个单位长度的速度运动,设运动时间为t秒.
①当点M运动过程中能否存在MN⊥AC?如果存在,请求出t的值;如果不存在,请说明理由;
②当点M运动到何处时,四边形ADMN的面积最小?并求出其最小面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396f29d43e9467da20dd90dd1b987b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06521ee0279c12332c9dad5403c8aa8.png)
(1)求该二次函数的表达式;
(2)动点M沿线段CD从C到D,同时动点N沿线段AC从A到C都以每秒1个单位长度的速度运动,设运动时间为t秒.
①当点M运动过程中能否存在MN⊥AC?如果存在,请求出t的值;如果不存在,请说明理由;
②当点M运动到何处时,四边形ADMN的面积最小?并求出其最小面积.
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772185496502272/2778068234387456/STEM/8b3e9ef5b8204567ac752901ec8b33df.png?resizew=243)
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较难
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名校
【推荐2】已知:抛物线
与
轴交于点
、
两点,
为抛物线顶点.曲线段
是双曲线上的一段,点
,点
.
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149093544574976/3150009311223808/STEM/f7b274a37bdb42b6af0b0e245aec36dd.png?resizew=218)
(1)如图,当抛物线经过点
时,
①请求出这个抛物线的解析式,并求出点
、
的坐标;
②该抛物线是否存在一点异于点
的点
使得
,若存在请求出点
坐标,若不存在请说明理由;
③若
、
为抛物线上两点,且
,直接写出
、
的大小关系.
(2)若抛物线
与曲线段
有交点,则满足条件的整数
有________个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ac5e247e0b2cce445d3765fe5eefb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b180d89c401fc48bc9c533031ab4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0c618a8b371673e2d69e1719e36f3e.png)
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149093544574976/3150009311223808/STEM/f7b274a37bdb42b6af0b0e245aec36dd.png?resizew=218)
(1)如图,当抛物线经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b180d89c401fc48bc9c533031ab4c.png)
①请求出这个抛物线的解析式,并求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②该抛物线是否存在一点异于点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e8678d086446ae80fcbbe02c564c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae36fe546501e4e54907fd48690b4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c70c416d5c4d7098774ba338a0a2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ac5e247e0b2cce445d3765fe5eefb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次