如图,抛物线y=ax2+bx+c经过点A(5,0),B(-3,0),C(0,4),过C作CD∥x轴交抛物线于D,连结BC、AD,两个动点P、Q分别从A、B两点同时出发,都以每秒1个单位长度的速度运动,其中,点P沿着线段AB向B点运动,点Q沿着折线B→C→D的路线向D点运动,设这个两个动点运动的时间为t(秒)(0<t<7),△PQB的面积记为S.
(1)求这条抛物线的函数关系式;
(2)求S与t的函数关系式;
(3)当t为何值时,S有最大值,最大值是多少?
(4)是否存在这样的t值,使得△PQB是直角三角形?若存在,请直接写出t的值;若不存在,请说明理由.
(1)求这条抛物线的函数关系式;
(2)求S与t的函数关系式;
(3)当t为何值时,S有最大值,最大值是多少?
(4)是否存在这样的t值,使得△PQB是直角三角形?若存在,请直接写出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/42a5fc24-c3f6-4d20-96f7-f6b7bc64285e.png?resizew=176)
21-22九年级上·云南玉溪·期末 查看更多[1]
(已下线)云南省玉溪市易门县龙泉中学2020-2021学年九年级数学上学期期末模拟1
更新时间:2021-01-18 17:35:47
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【推荐1】如图,在平面直角坐标系中,直线y=x+1与抛物线y=x2+bx+c交于A,B(4,5)两点,点A在x轴上.
(1)求抛物线的解析式;
(2)点E是线段AB上一动点(点A,B除外),过点E作x轴的垂线交抛物线于点F,当线段EF的长度最大时,求点E的坐标;
(3)在(2)的条件下,抛物线上是否存在一点P,使∠PEF=90°?若存在,求出点P的坐标;若不存在,说明理由.
(1)求抛物线的解析式;
(2)点E是线段AB上一动点(点A,B除外),过点E作x轴的垂线交抛物线于点F,当线段EF的长度最大时,求点E的坐标;
(3)在(2)的条件下,抛物线上是否存在一点P,使∠PEF=90°?若存在,求出点P的坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/7/2420956141477888/2435746466897920/STEM/793b04ea71404a8497b4094661b67713.png?resizew=120)
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【推荐2】已知:抛物线
(a≠0)交x轴于点A、B两点(A左B右),交y轴负半轴于点C,OB=OC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/23513fac-def8-46c1-a52b-739b20f91500.png?resizew=451)
(1)如图1,求抛物线的解析式;
(2)如图2,P是第一象限抛物线上一点,连接PC、BC、PB,设点P的横坐标为t,△BCP的面积为S,求S与t之间的函数关系式(不要求写出自变量的取值范围);
(3)如图3,在(2)的条件下,连接AP与y轴交于点E,过点C作x轴的平行线交抛物线于点D,点F为线段OC延长线上一点,连接ED、FD,若
求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a080de92a397693ae375bbab6f982b5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/23513fac-def8-46c1-a52b-739b20f91500.png?resizew=451)
(1)如图1,求抛物线的解析式;
(2)如图2,P是第一象限抛物线上一点,连接PC、BC、PB,设点P的横坐标为t,△BCP的面积为S,求S与t之间的函数关系式(不要求写出自变量的取值范围);
(3)如图3,在(2)的条件下,连接AP与y轴交于点E,过点C作x轴的平行线交抛物线于点D,点F为线段OC延长线上一点,连接ED、FD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f24b7ecc184e90430dc115059b9ec9.png)
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名校
【推荐1】如图,E为正方形
中
边上的一个动点,
,以
为边画正方形
与边
交于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/f7b0b363-ef17-47db-8594-1cc92989a973.png?resizew=145)
(1)当E为边
的中点时,求
的长;
(2)当
时,连接
,求
的长;
(3)连接
,
,求
面积的最小值.
![](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/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/f7b0b363-ef17-47db-8594-1cc92989a973.png?resizew=145)
(1)当E为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc9f12e928cfdebd473709af1348c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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【推荐2】已知抛物线
经过
三点,顶点为P.
(1)求抛物线的解析式;
(2)如果
是等边三角形,求
的面积;
(3)若直线
与抛物线交于D,E两点,直线
与抛物线交于F,G两点,
的中点为M,
的中点为N,且
.求点P到直线
距离的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68302bd7826c360745bc2d429672e0f1.png)
(1)求抛物线的解析式;
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fbfc036ef1ad11cb4a0f83cafd1847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560a9a0b9b9aae827b6c1c31c0e67153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db1b6bdbe62c88c9f874aa343359bbae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐1】如图,
为
的直径,
为弦,
为
的切线,C为切点,点E在
上,
.连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/43797da5-50c1-4603-b872-74bb69dc10d9.png?resizew=181)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0105d0889f6fa9cb5430cf9e09337173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/43797da5-50c1-4603-b872-74bb69dc10d9.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d5ee2d6fcbcad17b69997ef0741d2d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1f00915289b841bc2e4ba718e18c51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】在△ABC中,∠C=90°,BC=8厘米,AC=6厘米,点P从点B出发,沿BC向点C以2厘米/秒的速度移动,点Q从点C出发,沿CA向点A以1厘米/秒的速度移动.如果P、Q分别从B、C同时出发:
(1)经过t秒时,△CPQ的面积等于4,求t的值.
(2)若以C、P、Q为顶点的三角形恰与△ABC相似,求时间t的值.
(1)经过t秒时,△CPQ的面积等于4,求t的值.
(2)若以C、P、Q为顶点的三角形恰与△ABC相似,求时间t的值.
![](https://img.xkw.com/dksih/QBM/2017/12/18/1841129561513984/1843294169333760/STEM/5c4be16cc9aa44c1a112ddd869a8ee20.png?resizew=158)
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【推荐1】综合与探究
如图,经过
,
两点的抛物线
与
轴的另一个交点为
.
(1)求抛物线的解析式;
(2)点
在抛物线的对称轴上,当
的周长最小时,求
的坐标;
(3)已知点
在抛物线上,求
时的点
坐标;
(4)已知
,请直接写出能以点
,
,
,
为顶点的四边形是平行四边形的点
坐标.
如图,经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8794fdd5b979fa369ac350d063f631d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/227f99ed-21e3-4180-a627-6af8a128d602.png?resizew=170)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecdc5d3d0877e26d21384d8c315e817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79447c89e72300c29fdc1690a0f50991.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】抛物线
与x轴分别交于
,
两点(点
在点
的左侧),与
轴交于点
,抛物线对称轴为
,点
是第一象限抛物线上动点,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/f6e95b9e-6444-45f8-ae6b-339e960002ec.png?resizew=407)
(1)求抛物线和直线
的解析式;
(2)如图1,连接
,交
于点
,设
的面积为
,
的面积为
,求
的最小值及此时点
的坐标;
(3)如图2,设
,在直线
上方的抛物线上是否存在点
,使得
恰好等于
,若存在,求出点
的横坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115b05d5caee3d3c3d27c124a102a573.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/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3d1edbad451c1cc63be5ffb9b98018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/f6e95b9e-6444-45f8-ae6b-339e960002ec.png?resizew=407)
(1)求抛物线和直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ae0df0b9934dd820e797e501e7074b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8d03a113f0b00eddccbb580c8a0881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404fc19da3e4da41e9147e9f0ca64957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16d92d3ccdf0ecfaa43eb8ed62ae5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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