如图,已知抛物线y=
x2+bx+c与坐标轴交于A、B、C三点, A点的坐标为(-1,0),过点C的直线y=
x-3与x轴交于点Q,点P是线段BC上的一个动点,过P作PH⊥OB于点H.若PB=5t,且0<t<1.
![](https://img.xkw.com/dksih/QBM/2013/6/17/1573663618998272/1573663624437760/STEM/525955c7128c4353aa8106b962e8facc.png)
(1)填空:点C的坐标是 ,b= ,c= ;
(2)求线段QH的长(用含t的式子表示);
(3)依点P的变化,是否存在t的值,使以P、H、Q为顶点的三角形与△COQ相似?若存在,求出所有t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eb33b205522e59e6332fbb084d8a8bc.png)
![](https://img.xkw.com/dksih/QBM/2013/6/17/1573663618998272/1573663624437760/STEM/525955c7128c4353aa8106b962e8facc.png)
(1)填空:点C的坐标是 ,b= ,c= ;
(2)求线段QH的长(用含t的式子表示);
(3)依点P的变化,是否存在t的值,使以P、H、Q为顶点的三角形与△COQ相似?若存在,求出所有t的值;若不存在,说明理由.
11-12九年级上·北京西城·期中 查看更多[2]
更新时间:2019-01-30 18:14:09
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【推荐1】如图,抛物线
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/5c67050d-4223-4ad1-a1b5-638a3e84179c.png?resizew=384)
(1)求该抛物线的函数表达式;
(2)若
是线段
上方抛物线上一点,过点
作
轴,交
于
,
是
的右侧,线段
上方抛物线上一点,过点
作
轴,交
于
,
与
间的距离为2,连接
,当四边形
的面积最大时,求点
的坐标以及四边形
面积的最大值;
(3)将抛物线向右平移1个单位的距离得到新抛物线,点
是平面内一点,点
为新抛物线对称轴上一点.
,
也随之平移,若以
,
,
,
为顶点的四边形是菱形,请直接写出点
的坐标,并把求其中一个点
坐标的过程写出来;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4ba9951e8d7b38e5eaf9856fd2b496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e46eeded8de50cecdf831d0a9996727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda35bbafb908ccc8acde08234a1ab03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/5c67050d-4223-4ad1-a1b5-638a3e84179c.png?resizew=384)
(1)求该抛物线的函数表达式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6dae8c5a2ee80f3ec7b589e6141866f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60dc9f8e47e78b7f4ab2dd9cd559f601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c53c6732c071c7e4ea5e50e02aa1f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eacd9c1ce5e65fec29c32f40d86b73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de4cba79355500634451b17eab890b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de4cba79355500634451b17eab890b8.png)
(3)将抛物线向右平移1个单位的距离得到新抛物线,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
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【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于点
和点
点
在
的右侧
,与
轴交于点
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/40efc3a0-8e18-4876-9a56-d1e1f57361b8.png?resizew=247)
(1)求
、
的值;
(2)如图
,若点
是点
下方
轴上一动点,过
作
交直线
于
,求代数式
的最小值,并求出取得最小值时点
的坐标;
(3)如图
,在第(2)问当代数式
取得最小值时的条件下,将抛物线
向右平移
个单位长度得到新抛物线,平移后的新抛物线与原抛物线相交于点
,
为直线
上一点,点
为平面坐标系内一点,直接写出所有使得以点
、
、
、
为顶点的四边形是菱形的点
的坐标,并写出其中一个点
的坐标的解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.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/3a920a78c48e71749017d40e01caa3a3.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/04582116cd765fcc5a52f44279ad6c94.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/6541748f10d7ed5f755f456536dbc829.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/40efc3a0-8e18-4876-9a56-d1e1f57361b8.png?resizew=247)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f88eaaf9ee159d2f7eb83caa9904f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f88eaaf9ee159d2f7eb83caa9904f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】如图1,抛物线
与x轴交于点A和点B,与y轴交于点C.点P是抛物线上一点,且在直线
的上方.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/db3c571b-bcef-4497-ab0b-c56463eb59b3.png?resizew=580)
(1)直接写出点A的坐标为 ,点B的坐标为 ;
(2)当点P的坐标为
时,求四边形
的面积;
(3)如图2,
交
于点D.
交
于点E,记
的面积分别为
,判断
是否存在最大值.若存在,求出最大值;若不存在,请说明理由.
(4)如图3,点C在线段
上,满足
,
,直线
过点M,直线
过点N,且
,求直线
与
之间的最大距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/db3c571b-bcef-4497-ab0b-c56463eb59b3.png?resizew=580)
(1)直接写出点A的坐标为 ,点B的坐标为 ;
(2)当点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69abe959988e4c8c0739f5857ccfb0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b20a13f2d8d5b4ea72cd889dc307d3.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d60f55c585f1b455027202684b13e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0d09869265bfddb561ba21f79d4cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf4e20ea341827ce5f9552daee39462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2a89833c363fe06a5ae1524fa65144.png)
(4)如图3,点C在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cb59543ccf42b37ebce3f67416e561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1defd7bd31b50762679d1439aa9b67cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4482c4a3bd4864b8fba93da916558920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
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【推荐2】如图,已知抛物线y=ax2+bx+c与x轴相交于A(﹣2,0),B(4,0),与y轴相交于点C,且抛物线经过点(2,2).
(1)求此抛物线的解析式;
(2)在抛物线的对称轴上找一点H,使AH+CH最小,并求出点H的坐标;
(3)在第四象限内,抛物线上是否存在点M,是的以点A、B、M为顶点的三角形与△ABC相似?若存在,请求出点M的坐标;若不存在,请说明理由.
(1)求此抛物线的解析式;
(2)在抛物线的对称轴上找一点H,使AH+CH最小,并求出点H的坐标;
(3)在第四象限内,抛物线上是否存在点M,是的以点A、B、M为顶点的三角形与△ABC相似?若存在,请求出点M的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/12/8/1579032297644032/1579032298143744/STEM/f4f00845b34349edbcf6c79b32504081.png)
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【推荐3】如图,在平面直角坐标系中,直线
与x轴、y轴分别交于A,B两点,抛物线
(a为常数)与y轴交于点C.请完成下列问题;
(1)当抛物线经过点A时如图1,请求出A点坐标及抛物线的解析式;
(2)在(1)的条件下,抛物线
与直线
的另一个交点为E.抛物线的对称轴与直线
交于点D,若F为抛物线对称轴上的一个动点,以D、E、F为顶点的三角形能否与△ABC相似?若能,请求出所有F点的坐标,若不能,请说明理由.
(3)在函数
中若自变量x的取值范为
,请直接写出函数最大值与最小值的差(结果用含a的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
(1)当抛物线经过点A时如图1,请求出A点坐标及抛物线的解析式;
(2)在(1)的条件下,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
(3)在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966d9dd819cba29980da3700422c2497.png)
![](https://img.xkw.com/dksih/QBM/2020/10/30/2582176348119040/2582212544192512/STEM/da9ab54cf26549d3a6c3b4f1e2390ce8.png?resizew=392)
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