已知抛物线
(b,c为常数)的图象与x轴交于
,B两点(点A在点B左侧).与y轴相交于点C,顶点为D.
(1)当b=2时,求抛物线的顶点坐标;
(2)若点P是y轴上一点,连接BP,当PB=PC,OP=2时,求b的值;
(3)若抛物线与x轴另一个交点B的坐标为
,对称轴交x轴于点E,点Q是线段DE上一点,点N为线段AB上一点,且AN=2BN,连接NQ,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
(1)当b=2时,求抛物线的顶点坐标;
(2)若点P是y轴上一点,连接BP,当PB=PC,OP=2时,求b的值;
(3)若抛物线与x轴另一个交点B的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accf852805b3e0cec6fce861f51291e5.png)
2022·天津河北·二模 查看更多[2]
更新时间:2022-05-31 00:01:14
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相似题推荐
解答题-问答题
|
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【推荐1】如图,抛物线交
轴于
、
两点(点
在点
的左边),交
轴于点
,直线
经过点
与
轴交于点
,抛物线的顶点坐标为
.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189259497930752/2190275155533824/STEM/5e7e9ae62eee4fba9611c0e458561209.png?resizew=163)
(1)请你求出
的长及抛物线的函数关系式;
(2)求点
到直线
的距离;
(3)若点
是抛物线位于第一象限部分上的一个动点,则当点
运动至何处时,恰好使
,请你直接写出此时的
点坐标.
![](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/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921f59796f516e630dcfda68d706def1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c88b7907befa90aaf01557fb468349.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189259497930752/2190275155533824/STEM/5e7e9ae62eee4fba9611c0e458561209.png?resizew=163)
(1)请你求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(3)若点
![](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/f3239c4f6e9979192a2a305663a5bffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图,抛物线
与
轴相交于
两点,点
在点
的右侧,与
轴相交于点
.
![](https://img.xkw.com/dksih/QBM/2020/2/11/2396642537324544/2397521094483968/STEM/031bb450-7634-4648-a3f2-2d200043ab6e.png?resizew=281)
求点
的坐标;
在抛物线的对称轴上有一点
,使
的值最小,求点
的坐标;
点
为
轴上一动点,在抛物线上是否存在一点
,使以
四点构成的四边形为平行四边形?若存在,求点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7e706b4bd72f83d26094fd7099e415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/2020/2/11/2396642537324544/2397521094483968/STEM/031bb450-7634-4648-a3f2-2d200043ab6e.png?resizew=281)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c3a4038ea051accf0922cc52291797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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解题方法
【推荐1】如图,在平面直角坐标系xOy中,二次函数y=ax2﹣4ax+3的图象与x轴正半轴交于点A、B,与y轴相交于点C,顶点为D,且tan∠CAO=3.
(1)求这个二次函数的解析式;
(2)点P是对称轴右侧抛物线上的点,联结CP,交对称轴于点F,当S△CDF:S△FDP=2:3时,求点P的坐标;
(3)在(2)的条件下,将△PCD沿直线MN翻折,当点P恰好与点O重合时,折痕MN交x轴于点M,交y轴于点N,求
的值.
(1)求这个二次函数的解析式;
(2)点P是对称轴右侧抛物线上的点,联结CP,交对称轴于点F,当S△CDF:S△FDP=2:3时,求点P的坐标;
(3)在(2)的条件下,将△PCD沿直线MN翻折,当点P恰好与点O重合时,折痕MN交x轴于点M,交y轴于点N,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed662f113b72e4146fff5d0c4c7ffde.png)
![](https://img.xkw.com/dksih/QBM/2020/5/30/2473641897492480/2475832565792768/STEM/7f7395daaaf7491493c9a134f819df97.png?resizew=492)
您最近一年使用:0次
【推荐2】综合与实践
[动手操作]任意一个四边形
通过剪裁,都可以拼接成一个三角形,方法如下:如图1,E,F,G,H分别是边
,
,
,
的中点,连接
,P是线段
的中点,连接
,
,沿线段
,
,
剪开,将四边形
分成①,②,③,④四部分,按如图2所示的方式即可拼成一个无缝隙也不重叠的
.
关于在拼接过程中用到的图形的变换,说法正确的是( )
A.①→①是轴对称B.②→②是平移
C.③→③是中心对称D.④→④是中心对称
[性质探究]如图3,连接
,
,
,判断四边形
的形状,并说明理由.
[综合运用]若
是一个边长为4的等边三角形,则四边形
的对角线
的最小值为__________.
[动手操作]任意一个四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d06177a597dd24f7c94f6ce775b2d2.png)
关于在拼接过程中用到的图形的变换,说法正确的是( )
A.①→①是轴对称B.②→②是平移
C.③→③是中心对称D.④→④是中心对称
[性质探究]如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53b44617f5b4845321620a65260dc32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaebc9408ba1baf77c436b68a0dacce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a60cdd5ef7ddb20e860cf1c48ca67.png)
[综合运用]若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d06177a597dd24f7c94f6ce775b2d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a60cdd5ef7ddb20e860cf1c48ca67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aff046445f1f011dfe90ee951184525d.png)
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586372046823424/2588016855040000/STEM/26b023f9-3aef-42f3-9ff7-0815a580245b.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】已知:抛物线
经过
,
,
三点.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967901190619136/2977689648373760/STEM/dfbf42d8d255454985582f1401b74d8f.png?resizew=527)
(1)求抛物线的解析式;
(2)如图
,点
为直线
上方抛物线上任意一点,连
、
、
,
交直线
于点
,设
,求当
取最大值时点
的坐标,并求此时
的值.
(3)如图
,点
为抛物线对称轴与
轴的交点,点
关于
轴的对称点为点
.
①直接写出
的周长______;
②直接写出
的值______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.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/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967901190619136/2977689648373760/STEM/dfbf42d8d255454985582f1401b74d8f.png?resizew=527)
(1)求抛物线的解析式;
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d86e8928530a34ff3721b998ad5e058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab142c659d5434d88d7f6f5d994cfd18.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f95865a1d7733fa69387d316100d4a7.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图,已知抛物线y=ax2+4x+c经过A(2,0)、B(0,﹣6)两点,其对称轴与x轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989885359636480/2992188280463360/STEM/ea8d19b9-b578-4e0d-9783-2fa69dcd2a30.png?resizew=199)
(1)求该抛物线和直线BC的解析式;
(2)设抛物线与直线BC相交于点D,求△ABD的面积;
(3)在该抛物线的对称轴上是否存在点Q,使得△QAB的周长最小?若存在,求出Q点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989885359636480/2992188280463360/STEM/ea8d19b9-b578-4e0d-9783-2fa69dcd2a30.png?resizew=199)
(1)求该抛物线和直线BC的解析式;
(2)设抛物线与直线BC相交于点D,求△ABD的面积;
(3)在该抛物线的对称轴上是否存在点Q,使得△QAB的周长最小?若存在,求出Q点的坐标;若不存在,请说明理由.
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名校
【推荐3】平面直角坐标系中,抛物线
与直线
交于点
,
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/66d7a935-fc97-4986-aa4e-36ecb8406259.png?resizew=442)
(1)求抛物线的函数表达式及顶点坐标;
(2)如图1,连接
,点P是线段
上方抛物线上的一个动点,过点P作PZ
x轴交
于点Z,过点P作PQ
CB交直线
于点Q,求
的最大值及此时点P的坐标;
(3)如图2,在(2)的条件下,将该抛物线向下平移
个单位,向右平移3个单位,使得P点对应点
.点S是新抛物线对称轴上一点,在平面上否存在一点N,使以
、S、A、N为顶点的四边形是菱形,若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017a8043082e4b71bdb8adf50cdc3249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7eb83db01465eb2350056877adac92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/66d7a935-fc97-4986-aa4e-36ecb8406259.png?resizew=442)
(1)求抛物线的函数表达式及顶点坐标;
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017a8043082e4b71bdb8adf50cdc3249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ddba844319f4864a8e3a8375bd845.png)
(3)如图2,在(2)的条件下,将该抛物线向下平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee3c61d2298e75fc4f1643f8ebc2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
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