某数学兴趣小组运用《几何画板》软件探究
型抛物线图象.发现:如图1所示,该类型图象上任意一点
到定点
的距离
,始终等于它到定直线
的距离
(该结论不需要证明).他们称:定点F为图象的焦点,定直线
为图象的准线,
叫做抛物线的准线方程.准线
与
轴的交点为
.其中原点
为
的中点,
.例如,抛物线
,其焦点坐标为
,准线方程为
,其中
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/9a4b9e4b-9e29-40b4-a726-e1e38c0dcc7a.jpg?resizew=505)
【基础训练】
(1)请分别直接写出抛物线
的焦点坐标和准线
的方程:__________,__________;
【技能训练】
(2)如图2,已知抛物线
上一点
到焦点
的距离是它到
轴距离的3倍,求点
坐标;
【能力提升】
(3)如图3,已知抛物线
的焦点为
,准线方程为
.直线
,过抛物线上
点作
轴垂线,交直线
于点
,
,
,当
时,请直接写出
点横坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60b6eee6448a408616e1b61bd793f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd74b5a94a7fc4584a8ba2615ee4ba26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be4f48d2f5b404bc554ce3ce26f2b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4418c0618a712877287ca49a222c07f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65a79be0823c8a3ebe454413adeaf99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108c18cb76d7d34b05c991a644c8b136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d96a9022a96d3432305ad887d6e1d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/182e565b0b31c49c0452612772fef8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f04ce13aa25ab2713cfb5b20ece79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8846a18257c0be81d0b4557baf80aada.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/9a4b9e4b-9e29-40b4-a726-e1e38c0dcc7a.jpg?resizew=505)
【基础训练】
(1)请分别直接写出抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
【技能训练】
(2)如图2,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
【能力提升】
(3)如图3,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b81396024beba6ed1b634707b5afe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd712aceda0c273957f43e157427ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a7e5df89fc250955eb21e403bd2ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126a5a5d83b7d8203113c52a298acc1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2024-01-18 09:52:19
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相似题推荐
解答题-问答题
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【推荐1】在平面直角坐标系中,已知抛物线
(b、c是常数)经过点
和
,点P在这个抛物线上,不与点A、B重合,设点P的横坐标为m.
(1)求此抛物线对应的函数表达式;
(2)当
时,若y的最大值与最小值之和为2,求m的值;
(3)当点P在第一象限时,连接
交于点C,求
的最大值;
(4)已知点
,点
,点F在平面直角坐标系内,以点P、D、E、F为顶点构造矩形.当抛物线与矩形的边有2个交点时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
(1)求此抛物线对应的函数表达式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f52db3046e7c92b3a7fdd6c34657663.png)
(3)当点P在第一象限时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6f499ebf2637b658df7a5ab6b44619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662123786aca9908ed092f90b6f38d6a.png)
(4)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91cb3490c45b3388b227e46f847b1712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdb648d45fb0ba6382360c8d3734a45.png)
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【推荐2】如图,直线
与
轴、
轴分别相交于点B、C,经过B、C两点的抛物线
与
轴的另一个交点为A,顶点为P,且对称轴为直线
。点G是抛物线
位于直线
下方的任意一点,连接PB、GB、GC、AC .
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372118402449408/2372842933141504/STEM/04857b418fdf4f369a73e00b7ed3d095.png?resizew=170)
(1)求该抛物线的解析式;
(2)求△GBC面积的最大值;
(3)连接AC,在
轴上是否存在一点Q,使得以点P,B,Q为顶点的三角形与△ABC相似?若存在,求出点Q的坐标;若不存在,请说明理由。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://img.xkw.com/dksih/QBM/2020/1/7/2372118402449408/2372842933141504/STEM/04857b418fdf4f369a73e00b7ed3d095.png?resizew=170)
(1)求该抛物线的解析式;
(2)求△GBC面积的最大值;
(3)连接AC,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】在平面直角坐标系
中,抛物线
与x轴的交点为点A,B.
(1)求抛物线的顶点坐标.
(2)
.
①求抛物线的解析式.
②已知点C的坐标为
,点D在抛物线的对称轴上,将抛物线在
的部分记为图象G,若直线
与图象G只有1个公共点,结合函数图象,求点D的纵坐标t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe56be699b1f6c9d5c51094ebf668f78.png)
(1)求抛物线的顶点坐标.
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
①求抛物线的解析式.
②已知点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f816b2515758e5c5ec30c9f06f82ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b94f151c00959a1cd3946e7f8405337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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名校
【推荐2】如图,已知二次函数
的图像与
轴交于
、
两点(点
在点
的右侧),与
轴交于点
,连结
、
.
(1)求
的周长;
(2)点
为二次函数
的图像上一点,且位于直线
下方.过点
作直线
轴交直线
于点
.求线段
长度的最大值及此时点
的坐标;
(3)将二次函数
的图像向左平移1个单位长度,再向下平移
个单位长度得到新的二次函数
的图像.新二次函数
的图像的顶点为点
.在
轴上确定一点
,使得
是以线段
为腰的等腰三角形.请直接写出所有符合条件的点
的坐标,并写出求点
的坐标的其中一种情况的过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3147239b662832f9c0be5360184a88.png)
![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/53082585-df55-410c-8cf1-9bd361907ff8.png?resizew=302)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3147239b662832f9c0be5360184a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)将二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3147239b662832f9c0be5360184a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐3】综合与探究
如图,在平面直角坐标系xOy中,抛物线W的函数表达式为y=﹣x2+2x+3,抛物线W与x轴交于A、B两点(点A在点B的右侧),与y轴交于点C,它的顶点为D,直线l经过A、C两点.
(1)求点A、B、C、D的坐标.
(2)将直线l向下平移m个单位,对应的直线为l′.
①若直线l′与x轴的正半轴交于点E,与y轴的正半轴交于点F,△AEF的面积为S,求S关于m的函数关系式,并写出自变量m的取值范围;
②求m的值为多少时,S的值最大?最大值为多少?
(3)若将抛物线W也向下平移m单位,再向右平移1个单位,使平移后得到的二次函数图象的顶点P落在△AOC的内部(不包括△AOC的边界),请直接写出m的取值范围.
如图,在平面直角坐标系xOy中,抛物线W的函数表达式为y=﹣x2+2x+3,抛物线W与x轴交于A、B两点(点A在点B的右侧),与y轴交于点C,它的顶点为D,直线l经过A、C两点.
(1)求点A、B、C、D的坐标.
(2)将直线l向下平移m个单位,对应的直线为l′.
①若直线l′与x轴的正半轴交于点E,与y轴的正半轴交于点F,△AEF的面积为S,求S关于m的函数关系式,并写出自变量m的取值范围;
②求m的值为多少时,S的值最大?最大值为多少?
(3)若将抛物线W也向下平移m单位,再向右平移1个单位,使平移后得到的二次函数图象的顶点P落在△AOC的内部(不包括△AOC的边界),请直接写出m的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876607653249024/1877896615002112/STEM/cd81b284dc0245ca9cba9b162cdeab6f.png?resizew=219)
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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,与直线
:
交于点
、
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/f4b0c237-d507-4bf6-ad55-5b8ad41d9d04.png?resizew=182)
(1)求抛物线解析式及顶点
的坐标.
(2)求点
的坐标,并结合图象写出不等式
的解集.
(3)将直线
向下平移,在平移过程中与抛物线
部分图象有交点时
包含
,
端点
,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b081fba8461ecdbd6c14c8d97ea6be48.png)
![](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/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8578000985b74cbcaa3de6e14cb26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651ca79886cf911c55c48cba2a6a2acd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/f4b0c237-d507-4bf6-ad55-5b8ad41d9d04.png?resizew=182)
(1)求抛物线解析式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f49e4207eb1d919cb94cb07eebdfc43.png)
(3)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,矩形,
,
.点
在
的延长线上,
.动点
从点
出发,沿边
以
的速度向点
运动.过
点作
,交
于点
,过点
作
于
.设动点
的运动时间是
.
(1)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0ec7e38887232e73e017f31ee95657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb194fd63b75af067ba10dee7471d299.png)
①求与
之间的函数关系式;
②若四边形的面积
不小于
,请直接写出
的取值范围;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3062fbd3c74aa080a4bcbc0e7246c0.png)
您最近一年使用:0次