如图1,二次函数
的图象经过点
.
(1)求二次函数的表达式;
(2)若点P在二次函数对称轴上,当
面积为5时,求P坐标;
(3)小明认为,在第三象限抛物线上有一点D,使
;请判断小明的说法是否正确,如果正确,请求出D的坐标;如果不正确,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b1531145357cb95882bd4ccf3d222c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/2712c925-b6b0-4ee8-a6b4-0734aed9d13b.png?resizew=382)
(1)求二次函数的表达式;
(2)若点P在二次函数对称轴上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
(3)小明认为,在第三象限抛物线上有一点D,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0467af1949751d1b6773cd6027b321ce.png)
2023·山东泰安·中考真题 查看更多[3]
更新时间:2023-07-17 11:09:59
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解答题-问答题
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【推荐1】定义:若一条抛物线上存在一点到两坐标轴的距离相等,则这个点称为等距离点,如:抛物线
上有三个等距离点
,
,
.
(1)下列说法正确的是______(填写所有正确答案的序号)
①任意一条抛物线上都存在等距离点;
②抛物线
上有且仅有两个等距离点,
③抛物线
上一定存在等距离点,
④抛物线
上最多存在4个等距离点.
(2)在平面直角坐标系
中,已知抛物线
的顶点为
,且该抛物线上有三个等距离点
,
,
.
①求点
的坐标;
②求
的面积;
③若在直线
上方的抛物线上存在一点
,使得以
,
,
,
为顶点的四边形的面积最大,求此时点
的坐标?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455ba3d3e46977fcbe5b71f8bb9df4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c84e7b41a841a230ed5f8a42309aa.png)
(1)下列说法正确的是______(填写所有正确答案的序号)
①任意一条抛物线上都存在等距离点;
②抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/659a3cd8f47b269749e3b7ebc89a4698.png)
③抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2d3d0cd37bb8b297447e92bb8f0d03.png)
④抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2d3d0cd37bb8b297447e92bb8f0d03.png)
(2)在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf1f04ac12f9713a7faeb520728569e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
③若在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图,在平面直角坐标系中,抛物线
(b,c为常数)与x轴正半轴的交点坐标是
,对称轴为直线
.
(2)点A,B均在这个抛物线上,点A的横坐标为a,点B的横坐标为
,将A,B两点之间的部分(包括A,B两点)记为图象G,设图象G的最高点的纵坐标与最低点的纵坐标的差为h.
①当A,B两点的纵坐标相等时,求h的值;
②当
时,直接写出a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef15881f79be657d0fb5a818967b86e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
(2)点A,B均在这个抛物线上,点A的横坐标为a,点B的横坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06525afacdee1259675b926b6001d2ae.png)
①当A,B两点的纵坐标相等时,求h的值;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aaff666159052a34b94607667f6f9b.png)
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【推荐1】在平面直角坐标系中,抛物线
与
轴交于
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a3622bdc-5401-4f5e-8cdc-65118c4362ee.png?resizew=340)
(1)求抛物线
对应的函数表达式;
(2)如图1,点
为直线
下方抛物线上的一动点,
于点
轴交
于点
.求线段
的最大值和此时点
的坐标;
(3)如图2,将抛物线
沿着
轴向左平移后得到抛物线
,若点
是抛物线
与
在
轴下方的交点且
,求抛物线
对应的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f869c4797de7628c81b3501d124bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2c8df5a6ca516e2ae13bdfb6144132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a3622bdc-5401-4f5e-8cdc-65118c4362ee.png?resizew=340)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ea5b4a5ad1741b0b26c6e6b06448b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6786da5a6c797abcc51bbe8e60dd815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a854f7f21e1b4d572bb9a9f5388ce9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
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【推荐2】如图,在平面直角坐标系中,A9m,0、Bm,0m0,以AB为直径的⊙M交y轴正半轴于点C,CD是⊙M的切线,交x轴正半轴于点D,过A作AECD于E,交⊙于F.
![](https://img.xkw.com/dksih/QBM/2019/7/20/2250983496957952/2256825744130048/STEM/49d8dcd10f6443ae89508d0c313d26bd.png?resizew=542)
(1)求C的坐标;(用含m的式子表示)
(2)①请证明:EFOB;②用含m的式子表示AFC的周长;
(3)若
,
,
分别表示
的面积,记
,对于经过原点的二次函数
,当
时,函数y的最大值为a,求此二次函数的解析式.
![](https://img.xkw.com/dksih/QBM/2019/7/20/2250983496957952/2256825744130048/STEM/49d8dcd10f6443ae89508d0c313d26bd.png?resizew=542)
(1)求C的坐标;(用含m的式子表示)
(2)①请证明:EFOB;②用含m的式子表示AFC的周长;
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd52b6f6b9ffeb8c62a0f6ffff0df5fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd112915e3fd40d62db4c8a3df1151a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacde53bafab0f5298a88d58fe503b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc0c1af634c7f69c1b52daa86860092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d68b0675ed0834ca1a58ad4d7f32d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e31372ebc93ef965b22d01594e06abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4486891e4540eaab2e0323ab69ad85b9.png)
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【推荐3】已知抛物线ykx24kx3kk0与x轴交于A、B两点(点A在点B的左边),与y轴交于点C,顶点为D.
(1)如图1,请求出A、B两点的坐标;
(2)点E为x轴下方抛物线ykx24kx3kk0上一动点.
①如图2,若k=1时,抛物线的对称轴DH交x轴于点H,直线AE交y轴于点M,直线BE交对称轴DH于点N,求MONH的值;
②如图3,若k2时,点F在x轴上方的抛物线上运动,连接EF交x轴于点G,且满足FBAEBA,当线段EF运动时,FGO的度数大小发生变化吗?若不变,请求出tanFGO的值;若变化,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179968565444608/2183723384905728/STEM/7112015ca42a4072bb372890fce2c2bd.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179968565444608/2183723384905728/STEM/bb2c35964310411ca8cb6bc2d82b37b0.png?resizew=167)
(1)如图1,请求出A、B两点的坐标;
(2)点E为x轴下方抛物线ykx24kx3kk0上一动点.
①如图2,若k=1时,抛物线的对称轴DH交x轴于点H,直线AE交y轴于点M,直线BE交对称轴DH于点N,求MONH的值;
②如图3,若k2时,点F在x轴上方的抛物线上运动,连接EF交x轴于点G,且满足FBAEBA,当线段EF运动时,FGO的度数大小发生变化吗?若不变,请求出tanFGO的值;若变化,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179968565444608/2183723384905728/STEM/7112015ca42a4072bb372890fce2c2bd.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179968565444608/2183723384905728/STEM/bb2c35964310411ca8cb6bc2d82b37b0.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179968565444608/2183723384905728/STEM/a78a6a2afcea40a395b7c8534190f3d8.png?resizew=151)
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【推荐1】如图,已知抛物线经过坐标原点O及A(
,0),其顶点为B(m,3),C是AB中点,点E是直线OC上的一个动点 (点E与点O不重合),点D在y轴上,且EO=ED.
(1)求此抛物线及直线OC的解析式;
(2)当点E运动到抛物线上时,求BD的长;
(3)连接AD,当点E运动到何处时,△AED的面积为
?请直接写出此时E点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d2404fc6c97d004761c99a9f995dbd.png)
(1)求此抛物线及直线OC的解析式;
(2)当点E运动到抛物线上时,求BD的长;
(3)连接AD,当点E运动到何处时,△AED的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91aab599106e72bcc2485637d99c852.png)
![](https://img.xkw.com/dksih/QBM/2012/2/26/1573348531306496/null/STEM/1e90a2cf4a8a4479af9534f6ceec8815.png?resizew=227)
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【推荐2】在平面直角坐标系中,直线
与x轴交于点A,与y轴交于点B,抛物线
经过A,B两点,并与x轴的正半轴交于点C.
(2)当
时,若点P是抛物线对称轴上的一个动点,求
周长的最小值
(3)当
时,若点
是直线
下方抛物线上的一个动点,当m取何值时,
的面积最大?并求出
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527644f53abbcfd2e8457da020cb0262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37efb179686525e1a0aec162008f605.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51e2b8f615b2cc7eca7fda25efb507d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005f97358b620c0e9f96aff7a18b2a4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
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