如图,在直角坐标xOy中,二次函数图象的顶点坐标为C(4,
),且在x轴上截得的线段AB的长为6.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/dde91053-3fa6-48d5-84f8-2eb2901d9f7f.png?resizew=202)
(1)求二次函数的解析式;
(2)在y轴上求作一点P(不写作法)使PA+PC最小,并求P点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/dde91053-3fa6-48d5-84f8-2eb2901d9f7f.png?resizew=202)
(1)求二次函数的解析式;
(2)在y轴上求作一点P(不写作法)使PA+PC最小,并求P点坐标.
更新时间:2022-04-08 06:01:29
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【推荐1】已知一次函数y=kx+b的图象经过点(-1,-5),且与正比例函数y= x的图象相交于点(2,a),求
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【推荐2】某商场销售一款服装,经市场调查发现,每月的销售量
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【推荐1】已知:如图,抛物线
经过原点
,它的对称轴为直线
,动点
从抛物线的顶点
出发,在对称轴上以每秒
个单位的速度向下运动,设动点
运动的时间为
秒,连接
并延长交抛物线于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/1e2a5544-dc90-4173-825d-80baa4ab338e.png?resizew=438)
(1)求抛物线解析式及顶点坐标;
(2)当三点
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,
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的值;
(3)将
沿直线
折叠后,那么点
的对称点
能否恰好落在坐标轴上?若能,请直接写出所有满足条件的
的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2600a54b7bf3f79aaec7d49a47f6b4d2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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(1)求抛物线解析式及顶点坐标;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703b40a6293ed9e33001e2919379b168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035a5a88e7e2d6ef2b47d992412a1f2f.png)
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【推荐2】如图,抛物线y=x-ax+b交x轴于A、B两点(点B在点A 的右边),交y轴的正半轴于C点.
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解答题-作图题
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解题方法
【推荐1】如图,在平面直角坐标系中,每个小正方形的边长均为1,点A的坐标为
.点B的坐标为
,点C的坐标为
.
(1)作出
关于y轴对称的
,其中
,
,
分别是A,B,C的对应点;
(2)写出
的坐标;
(3)在x轴上找一点P,使得
的值最小.(保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148d97803c3b16893ced41ad5cd9aba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138506a762e636aa75a4d54f5b739b89.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/6c12c93a-6630-4c72-814a-f7010fe81cb5.png?resizew=199)
(1)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
(3)在x轴上找一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5c49d49b35e2a2cf2596c85d504b1c.png)
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【推荐2】作图题:(5′+5′+5′,共15分)
(1)如图,已知∠AOB及点C、D两点,请利用直尺和圆规作一点P,使得点P到射线OA、OB的距离相等,且P点到点C、D的距离也相等.
(2)利用方格纸画出△ABC关于直线
的对称图形△A′B′C′.
(3)如图,已知在△ABC中,AB="AC" ,AD是BC边上的高,P是AB边上的一点,试在高AD上找一点E,使得△PEB的周长最短.
(1)如图,已知∠AOB及点C、D两点,请利用直尺和圆规作一点P,使得点P到射线OA、OB的距离相等,且P点到点C、D的距离也相等.
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(3)如图,已知在△ABC中,AB="AC" ,AD是BC边上的高,P是AB边上的一点,试在高AD上找一点E,使得△PEB的周长最短.
![](https://img.xkw.com/dksih/QBM/2014/11/13/1573756100755456/1573756106825728/STEM/c2b4ed7e1e4443c78b772edd8c737194.png?resizew=527)
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【推荐1】已知抛物线
交x轴于
,
两点,交y轴于点A,P是抛物线上一动点,设点P的横坐标为m,过点P作x轴的垂线PQ,过点A作
于点Q,连接AP(AP不平行x轴).
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(1)求抛物线的表达式.
(2)如图1,若
,求点P的坐标.
(3)如图2,若点P位于抛物线的对称轴的右侧,将
沿AP对折,点Q的对应点为
,当点
落在x轴上时,求点P的坐标.
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![](https://img.xkw.com/dksih/QBM/2022/1/4/2887403472248832/2890020311973888/STEM/224024eca3014b2f8a7abd94446a23ae.png?resizew=169)
(1)求抛物线的表达式.
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b487245bb02f425d0ae78bb4a9f3fd8.png)
(3)如图2,若点P位于抛物线的对称轴的右侧,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bff7ffe4b2650908f759868ea30898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bff7ffe4b2650908f759868ea30898.png)
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【推荐2】如图所示,直线
是
的对称轴,E,F是
上的任意两点.若
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