如图,抛物线
与
轴交于
,
两点.
(1)求该抛物线的解析式;
(2)设(1)中的抛物线交
轴于
点,在该抛物线的对称轴上是否存在点
,使得
的周长最小?若存在,求出
点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/a81cc958-c907-4204-9f19-e2520f302a1d.jpg?resizew=155)
(1)求该抛物线的解析式;
(2)设(1)中的抛物线交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548a857f02ae5b7d6cf07a86b7729124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
20-21九年级上·江西宜春·期中 查看更多[2]
江西省宜春市宜春实验中学2020-2021学年九年级上学期期中数学试题(已下线)专题2.42 二次函数压轴题-周长问题(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:2020-11-26 21:16:12
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解答题-计算题
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适中
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【推荐1】如图,小球M从斜坡
上的O点处抛出,建立如图所示的平面直角坐标系,球的抛出路线是抛物线
的一部分,斜坡可以看作直线
的一部分,若小球经过点
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/b4ae6313-b881-4415-a702-18a649daf6c4.png?resizew=128)
(1)小球在斜坡上的落点为A,求A点的坐标_______;
(2)在斜坡
上的B点有一棵树,B点的横坐标为2,树高为4,小球 M 能否飞过这棵树?通过计算说明理由;
(3)直接写出小球M在飞行的过程中离斜坡
的最大高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575fdf5d347fe9e8b177243f95254e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2d9ec71eaf17ea03ecba48b9a469a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8941c52aca774aeabef65fcb7f5eede3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/b4ae6313-b881-4415-a702-18a649daf6c4.png?resizew=128)
(1)小球在斜坡上的落点为A,求A点的坐标_______;
(2)在斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(3)直接写出小球M在飞行的过程中离斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208f155347298c2ad3949346c85aa504.png)
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名校
【推荐2】在直角坐标系中,
是坐标原点,抛物线
经过点
.
(1)求
的值.
(2)点
在线段
上,过点
,
分别作
轴的垂线交抛物线
点
. 试探究:
①当
为何值时,四边形
是平行四边形.
②
与
的面积之和是否为定值?若是,求出该定值:若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62df6feec0736be43171e25089d12677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5481b7b15af2531fef2efaf8140d409.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77640cf8901dae7c829cadb59cb71556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62df6feec0736be43171e25089d12677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f3df5713a423887c16e6355236372.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e72a855bb6d80737099e412ed52a26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
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【推荐1】如图,抛物线y=﹣x2+2x+3与x轴交于点A,C(点A在点C的右侧),与y轴交于点B
![](https://img.xkw.com/dksih/QBM/2019/6/5/2218914769240064/2219696626171904/STEM/3dc4ced69ce24788bccc8d539c96650b.png?resizew=129)
(1)求点A,B的坐标及直线AB的函数表达式;
(2)若直线l⊥x轴,且直线l在第一象限内与抛物线交于点M,与直线AB交于点N,求点M与点N之间的距离的最大值,并求出此时点M,N的坐标.
![](https://img.xkw.com/dksih/QBM/2019/6/5/2218914769240064/2219696626171904/STEM/3dc4ced69ce24788bccc8d539c96650b.png?resizew=129)
(1)求点A,B的坐标及直线AB的函数表达式;
(2)若直线l⊥x轴,且直线l在第一象限内与抛物线交于点M,与直线AB交于点N,求点M与点N之间的距离的最大值,并求出此时点M,N的坐标.
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【推荐2】已知抛物线
具有如下性质:给抛物线上任意一点到定点
的距离与到x轴的距离相等,如图,点M的坐标为
,P是抛物线
上一动点,则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2e237772-7865-4e35-a88f-aeadf5e52f74.png?resizew=177)
(1)当
面积为4时,求P点的坐标;
(2)求
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/659a3cd8f47b269749e3b7ebc89a4698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df80e89c0e6b9c87ec0af6e9209c23d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c550ceb75ad1705ec69dd13aaf020ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/659a3cd8f47b269749e3b7ebc89a4698.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/2e237772-7865-4e35-a88f-aeadf5e52f74.png?resizew=177)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c71c49dc9a9de1a0221769e4eb8616.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bab3935c404fe6f815f750e153dfae.png)
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