如图,对称轴为直线x=-1的抛物线y=a(x-h)
-4(a≠0)与x轴相交于A、B两点,与y轴交于点C,其中点A的坐标为(-3,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/5b73a579-968c-432d-b43e-f4b0ce8197e3.png?resizew=137)
(1)求该抛物线的解析式;
(2)若点P在抛物线上,且S△POC=4S△BOC.求点P的坐标;
(3)设点Q是线段AC上的动点,作QD⊥x轴交抛物线于点D,求线段QD长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/5b73a579-968c-432d-b43e-f4b0ce8197e3.png?resizew=137)
(1)求该抛物线的解析式;
(2)若点P在抛物线上,且S△POC=4S△BOC.求点P的坐标;
(3)设点Q是线段AC上的动点,作QD⊥x轴交抛物线于点D,求线段QD长度的最大值.
18-19九年级上·全国·单元测试 查看更多[4]
2018-2019学年度第一学期人教版五四制_九年级数学上册_第28章_二次函数_单元测试题云南省红河哈尼族彝族自治州开远市2019-2020学年九年级上学期期末数学试题(已下线)专题13 二次函数中的最(定)值问题(19宜宾、19绵阳)(决胜2020年中考压轴题全揭秘精品)四川专用辽宁省葫芦岛市绥中县2020-2021学年九年级上学期期末数学试题
更新时间:2020-01-08 22:29:06
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【推荐1】如图,在平面直角坐标系中,矩形
的边
与x轴、y轴的交点分别为
,抛物线
过B,C两点,动点M从点D开始以每秒5个单位长度的速度沿
的方向运动到达C点后停止运动.动点N从点O以每秒4个单位长度的速度沿
方向运动,到达C点后,立即返回,向
方向运动,到达O点后,又立即返回,依此在线段
上反复运动,当点M停止运动时,点N也停止运动,设运动时间为t.
![](https://img.xkw.com/dksih/QBM/2021/4/18/2702457271558144/2703137639047168/STEM/9cbadc91-f9c8-41df-b642-29aa3fb7d73e.png)
(1)求抛物线的解析式;
(2)求点D的坐标;
(3)过点D与x轴平行的直线,交抛物线的对称轴于点Q,将线段
沿过点B的直线翻折,点A的对称点为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200a03a3d04cb8112d6a65aef15a9a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b6c8d19a06f7a6cedfb0f4ec1ea4d4.png)
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(1)求抛物线的解析式;
(2)求点D的坐标;
(3)过点D与x轴平行的直线,交抛物线的对称轴于点Q,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
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【推荐2】《函数的图象与性质》拓展学习展示:
【问题】如图①,在平面直角坐标系中,抛物线
:
与
轴相交于
,
两点,与
轴交于点
,则
______,
______.
【操作】将图①中抛物线
沿
方向平移
长度的距离得到拋物线
,
在
轴左侧的部分与
在
轴右侧的部分组成的新图象记为
,如图②.请直接写出图象
对应的函数解析式.
【探究】在图②中,过点
作直线
平行于
轴,与图象
交于
,
两点,如图③.求出图象
在直线
上方的部分对应的函数
随
的增大而增大时
的取值范围.
【应用】
是抛物线
对称轴上一个动点,当
是直角三角形时,直接写出
点的坐标.
【问题】如图①,在平面直角坐标系中,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0e131843516f8735faf6c15094ed43.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://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
【操作】将图①中抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
【探究】在图②中,过点
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【应用】
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【推荐1】如图,抛物线
与x轴相交于A,B两点(点A位于点B的左侧),与y轴相交于点C,M是抛物线的顶点,直线
是抛物线的对称轴,且点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/17/c6e55a1f-9771-46f1-ba62-ba1c6b13be08.png?resizew=191)
(1)求抛物线的解析式;
(2)已知P为线段
上一个动点,过点P作
轴于点D.若
的面积为S.
①求S与m之间的函数关系式,并写出自变量m的取值范围;
②当S取得最大值时,求点P的坐标.
(3)在(2)的条件下,在线段
上是否存在点P,使
为等腰三角形?如果存在,直接写出满足条件的点P的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/17/c6e55a1f-9771-46f1-ba62-ba1c6b13be08.png?resizew=191)
(1)求抛物线的解析式;
(2)已知P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897e044e4e572fe3d9a7ac0baf8317bd.png)
①求S与m之间的函数关系式,并写出自变量m的取值范围;
②当S取得最大值时,求点P的坐标.
(3)在(2)的条件下,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
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【推荐2】如图,在平面直角坐标系中,二次函数的图象交坐标轴于A(﹣1,0),B(4,0),C(0,﹣4)三点,点P是直线BC下方抛物线上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/15771ad1-4055-46b9-90a2-d6ac3771bd25.png?resizew=262)
(1)求这个二次函数的解析式;
(2)动点P运动到什么位置时,△PBC面积最大,求出此时P点坐标和△PBC的最大面积.
(3)是否存在点P,使△POC是以OC为底边的等腰三角形?若存在,求出P点坐标;若不存在,请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/15771ad1-4055-46b9-90a2-d6ac3771bd25.png?resizew=262)
(1)求这个二次函数的解析式;
(2)动点P运动到什么位置时,△PBC面积最大,求出此时P点坐标和△PBC的最大面积.
(3)是否存在点P,使△POC是以OC为底边的等腰三角形?若存在,求出P点坐标;若不存在,请说明理由;
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