题型:解答题-问答题
难度:0.4
引用次数:243
题号:15687577
抛物线
过点A(-1,0),点B(3,0),与y轴交于C点.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968769615642624/2969226910556160/STEM/07f32675-313f-44cc-9ab4-6f0ffb2b92f1.png?resizew=494)
(1)求抛物线的表达式及点C的坐标;
(2)如图1,设M是抛物线上的一点,若∠MAB=45°,求M点的坐标;
(3)如图2,点P在直线BC下方的抛物线上,过点P作PD⊥x轴于点D,交直线BC于点E,过P点作PF⊥BC,交BC与F点,△PEF的周长是否有最大值,若有最大值,求出此时P点的坐标.若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968769615642624/2969226910556160/STEM/07f32675-313f-44cc-9ab4-6f0ffb2b92f1.png?resizew=494)
图1 图2
(1)求抛物线的表达式及点C的坐标;
(2)如图1,设M是抛物线上的一点,若∠MAB=45°,求M点的坐标;
(3)如图2,点P在直线BC下方的抛物线上,过点P作PD⊥x轴于点D,交直线BC于点E,过P点作PF⊥BC,交BC与F点,△PEF的周长是否有最大值,若有最大值,求出此时P点的坐标.若不存在,说明理由.
更新时间:2022-04-30 11:30:31
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【推荐1】在平面直角坐标系xOy中,抛物线
(
)与x轴交于点A、B两点.
(1)求抛物线的顶点坐标;
(2)若横、纵坐标都是整数的点叫做整点.
①当
时,求线段AB上的整点个数;
②若抛物线在A、B之间的部分与线段AB所围成的区域(包括边界)恰有七个整点,结合函数图象,求m的取值范围.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
(1)求抛物线的顶点坐标;
(2)若横、纵坐标都是整数的点叫做整点.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
②若抛物线在A、B之间的部分与线段AB所围成的区域(包括边界)恰有七个整点,结合函数图象,求m的取值范围.
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【推荐2】操作
在平面直角坐标系中,抛物线
解析式为
,抛物线
解析式为
.
先将抛物线
向上平移4个单位,再向右平移若干个单位后得到抛物线
,抛物线
与
轴交原点
和点
,且
.
(1)抛物线
的解析式为___________:(用
的形式表示),并在下面坐标系中画出抛物线
的图象.
探究
(2)当
的值变化时,①求证抛物线
的顶点一定在抛物线
上;②判断抛物线
是否恒经过一个定点.若存在这一定点,则求出这个定点,并判断这个定点与抛物线
有何关系,若不存在或与抛物线
无关系,则说明其理由.
应用
(3)当抛物线
的顶点在第一象限内,且
时,函数
的最大值与最小值之差为16,求
的值.
在平面直角坐标系中,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8541ae04cd34408d7fa5f797457ebc.png)
先将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/a6e3dfcd8aff269dd5aba398816490c6.png)
(1)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ddc0a29bfef85c1441d02ff117a183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
探究
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
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应用
(3)当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae51da9c4a1563f7a7c6ab949811a40.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/dddc651e-a1ab-4b76-9b89-754b87854220.png?resizew=508)
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【推荐1】如图,二次函数
的图象交x轴于A,B两点,交y轴于点C,点D是BC上方抛物线上的一点,过D作AC的平行线,交BC于点E.
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918103723171840/2919158238281728/STEM/e4c793da175d47d697290f0274f30c60.png?resizew=482)
(1)求△ABC的面积;
(2)连接CD,当CD∥x轴时,求△CDE的面积;
(3)求DE的最大值.
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(1)求△ABC的面积;
(2)连接CD,当CD∥x轴时,求△CDE的面积;
(3)求DE的最大值.
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【推荐2】如图,边长为2的正方形
的边
分别与x轴,y轴的正半轴重合,点D在对角线
上,连接
,交x轴于点E,点D的横坐标为m.
;
(2)求
面积的最大值;
(3)延长
与直线
交于点G,若
为等腰三角形,求
的长.
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(2)求
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(3)延长
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【推荐3】某农作物的生长率P与温度t
有如下关系:如图1,当
时可近似用函数
刻画,当
时可近似用函数
刻画.
(1)求h的值.
(2)按照经验,该作物提前上市的天数m(天)与生长率P满足函数关系:
①请运用记学的知识,求m关于P的函数表达式;
②请用含t的代数式表示m;
(3)天气寒冷,大棚加温可改变农作物生长速度.在(2)的条件下,原计划大恒温
时,每天的成本为200元,该作物30天后上市时,根据市场调查:每提前一天上市售出(一次售完),销售额可增加600元.因此给大棚继续加温,加温后每天成本w(元)与大棚温度t
之间的关系如图2,提前上市增加的利润和节省的成本为M,问当
时,提前上市多少天时M最大?并求此时M最大值(农作物上市售出后大棚暂停使用).
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(1)求h的值.
(2)按照经验,该作物提前上市的天数m(天)与生长率P满足函数关系:
生长率P | 0.2 | 0.3 | 0.4 | 0.5 |
提前上市的天数m(天) | 0 | 5 | 10 | 15 |
②请用含t的代数式表示m;
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解答题-计算题
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名校
【推荐1】在矩形
中,
为边
上一点,且
,点
是线段
上一动点,直线
与直线
相交于点
,射线
与直线
相交于点
,且
.已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/76f59411-e9ed-4381-8876-bccc76978c06.png?resizew=326)
(1)用含有
的代数式表示线段
的长,
______;
(2)①当点
与点
重合时,求线段
的长;
②若点
在线段
上,求
的范围;
(3)求
的面积(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97beb988073189e81aa717c362427e32.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/76f59411-e9ed-4381-8876-bccc76978c06.png?resizew=326)
(1)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
(2)①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4031d50318f8faa4b1eefd1dec796420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-问答题
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解题方法
【推荐2】如图,在平面直角坐标系xOy中,直线
与x轴、y轴分别交于点A、B.抛物线
(a≠0)经过点A,且与y轴相交于点C,∠OCA=∠OAB.
(1)求直线AB的表达式;
(2)如果点D在线段AB的延长线上,且AD=AC.求经过点D的抛物线
的表达式;
(3)如果抛物线
的对称轴与线段AB、AC分别相交于点E、F,且EF=1,求此抛物线的顶点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e135ef011079eefc5be74c10f7af2299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e721054f8fbba8e19578569bdb234249.png)
(1)求直线AB的表达式;
(2)如果点D在线段AB的延长线上,且AD=AC.求经过点D的抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e721054f8fbba8e19578569bdb234249.png)
(3)如果抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e721054f8fbba8e19578569bdb234249.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/a1419739-d3ea-493d-bc3b-0cf2e984782f.png?resizew=237)
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解答题-作图题
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【推荐3】已知:如图,在⊙O中,直径AB⊥CD于点E,连接BC.
![](https://img.xkw.com/dksih/QBM/2014/2/14/1573705169485824/1573705175916544/STEM/aabcfe9fcbfa448c9694d2f8e826a595.png)
(1)线段BC、BE、AB应满足的数量关系是 ;
(2)若点P是优弧
上一点(不与点C、A、D重合),连接BP与CD交于点G.
请完成下面四个任务:
①根据已知画出完整图形,并标出相应字母;
②在正确完成①的基础上,猜想线段BC、BG、BP应满足的数量关系是 ;
③证明你在②中的猜想是正确的;
④点P′恰恰是你选择的点P关于直径AB的对称点,那么按照要求画出图形后在②中的猜想仍然正确吗? ;(填正确或者不正确,不需证明)
![](https://img.xkw.com/dksih/QBM/2014/2/14/1573705169485824/1573705175916544/STEM/aabcfe9fcbfa448c9694d2f8e826a595.png)
(1)线段BC、BE、AB应满足的数量关系是 ;
(2)若点P是优弧
![](https://img.xkw.com/dksih/QBM/2014/2/14/1573705169485824/1573705175916544/STEM/995cc3d9e77c44b08dde2dca3e33195b.png)
请完成下面四个任务:
①根据已知画出完整图形,并标出相应字母;
②在正确完成①的基础上,猜想线段BC、BG、BP应满足的数量关系是 ;
③证明你在②中的猜想是正确的;
④点P′恰恰是你选择的点P关于直径AB的对称点,那么按照要求画出图形后在②中的猜想仍然正确吗? ;(填正确或者不正确,不需证明)
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【推荐1】如图,已知抛物线经过点
,
,
三点,点
是直线
绕点
逆时针旋转
后与
轴的交点,点
是线段
上的一个动点,设点
的坐标为
,过点
作
轴的垂线交抛物线于点
,交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2022/10/9/3084222677565440/3085359248285696/STEM/f2179b32be94409d95e15d9e95bbca45.png?resizew=120)
(1)求该抛物线所表示的二次函数的解析式;
(2)在点
运动过程中,若存在以
为直径的圆恰好与
轴相切,求
的值;
(3)连接
,将
绕平面内某点
旋转
后,得到
,点
、
、
的对应点分别是点
、
、
,是否存在点
使得
旋转后得到的
的两个顶点恰好落在抛物线上,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/b5f5da00bfcc99c7dead38c4dce0730f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a081d97d0f2cd61d76d3a07370aba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d373e0482030634d4d2165bf963d513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04fb5b01890ee8e11a10c90fb678ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1f71fcc47decc29804834cc7590515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://img.xkw.com/dksih/QBM/2022/10/9/3084222677565440/3085359248285696/STEM/f2179b32be94409d95e15d9e95bbca45.png?resizew=120)
(1)求该抛物线所表示的二次函数的解析式;
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4717e4827480f0f6f4ded85e52eab.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbb5b7f2ee20e0dbd876d69a84579e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc3e8a1475b983d1a4295db0e16d4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9d224009c445d6a65086f7ccf9c726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cf42ecb82e4a764d6bd301bbd0b79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9721059d158853671eaf19e39769b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d123b8eba45af84e79775bcf1cae55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc3e8a1475b983d1a4295db0e16d4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbb5b7f2ee20e0dbd876d69a84579e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cf42ecb82e4a764d6bd301bbd0b79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc3e8a1475b983d1a4295db0e16d4c2.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知:抛物线
经过坐标原点.
(1)求抛物线的解析式和顶点B的坐标;
(2)设点A是抛物线与x轴的另一个交点且A、C两点关于y轴对称,试在y轴上确定一点P,使PA+PB最短,并求出点P的坐标;
(3)过点A作AD∥BP交y轴于点D,求到直线AP、AD、CP距离相等的点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a67b55f33b5480f2572d7ec26638d5.png)
(1)求抛物线的解析式和顶点B的坐标;
(2)设点A是抛物线与x轴的另一个交点且A、C两点关于y轴对称,试在y轴上确定一点P,使PA+PB最短,并求出点P的坐标;
(3)过点A作AD∥BP交y轴于点D,求到直线AP、AD、CP距离相等的点的坐标.
您最近一年使用:0次