如图,直线y=x﹣3与x轴、y轴分别交于点B、点C,经过B、C两点的抛物线y=﹣x2+mx+n与x轴的另一个交点为A,顶点为P.
(1)求3m+n的值;
(2)在该抛物线的对称轴上是否存在点Q,使以C,P,Q为顶点的三角形为等腰三角形?若存在,求出有符合条件的点Q的坐标;若不存在,请说明理由.
(3)将该抛物线在x轴上方的部分沿x轴向下翻折,图象的其余部分保持不变,翻折后的图象与原图象x轴下方的部分组成一个“M“形状的新图象,若直线y=x+b与该“M”形状的图象部分恰好有三个公共点,求b的值.
(1)求3m+n的值;
(2)在该抛物线的对称轴上是否存在点Q,使以C,P,Q为顶点的三角形为等腰三角形?若存在,求出有符合条件的点Q的坐标;若不存在,请说明理由.
(3)将该抛物线在x轴上方的部分沿x轴向下翻折,图象的其余部分保持不变,翻折后的图象与原图象x轴下方的部分组成一个“M“形状的新图象,若直线y=x+b与该“M”形状的图象部分恰好有三个公共点,求b的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/75c68ca1-2c20-4979-a584-459001b3c32a.jpg?resizew=174)
18-19九年级·广东广州·期末 查看更多[9]
【区级联考】广东省广州市天河区2019届九年级(上)期末数学试题湖北省荆州市荆州区2019-2020学年九年级上学期期末数学试题江西省赣州市章贡区2021-2022学年九年级上学期期中数学试题江西省赣州市大余县2021-2022学年九年级上学期期末数学试题湖北省荆州市监利市2021-2022学年九年级上学期期末数学试题江西省南昌市十校联考2022-2023学年九年级上学期期中质量检测数学试卷广东省广州市黄埔区2023-2024学年九年级上学期期末数学试题湖北省黄冈市部分学校2023-2024学年九年级下学期开学考试数学试题湖北省知名中小学教联体联盟2023-2024学年九年级下学期开学考试数学试题
更新时间:2019-04-13 21:17:52
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相似题推荐
解答题-问答题
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名校
【推荐1】如图1,抛物线
与x轴交于
,
两点,与y轴交于点C.
(2)如图1,过点A作
交抛物线于点E,连接
,点P是x轴上点B左侧一动点,若
与
相似,求点P的坐标;
(3)如图2,抛物线顶点为D,对称轴与x轴交于点E,点T是
上一动点,过点T的直线(直线
除外)与抛物线交于G,H两点,直线
分别交x轴于点M,N.当
是定值16时,判断点T是否是定点?若是,求点T的坐标;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16403fc9b29d6d8e814318ee24a9dc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
(2)如图1,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(3)如图2,抛物线顶点为D,对称轴与x轴交于点E,点T是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1ab6c10bc0a8bfbdc3b4824c2de1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2d28601020d2fff34ff67047742b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f2599233ab889a17b84ef1a2522716.png)
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【推荐2】在平面直角坐标系中,抛物线y=﹣![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
+(m﹣1)x+2m与x轴交于A,B(4,0)两点,与y轴交于点C,点P是抛物线在第一象限内的一个动点.
![](https://img.xkw.com/dksih/QBM/2022/9/12/3064822420520960/3067611686887424/STEM/e4ecef8e92e94e65a256a6f4a8ae0069.png?resizew=406)
(1)求抛物线的解析式,并直接写出点A,C的坐标;
(2)如图甲,点M是直线BC上的一个动点,连接AM,OM,是否存在点M使AM+OM最小,若存在,请求出点M的坐标,若不存在,请说明理由;
(3)如图乙,过点P作PF⊥BC,垂足为F,过点C作CD⊥BC,交x轴于点D,连接DP交BC于点E,连接CP.设△PEF的面积为S1,△PEC的面积为S2,是否存在点P,使得
最大,若存在,请求出点P的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://img.xkw.com/dksih/QBM/2022/9/12/3064822420520960/3067611686887424/STEM/e4ecef8e92e94e65a256a6f4a8ae0069.png?resizew=406)
(1)求抛物线的解析式,并直接写出点A,C的坐标;
(2)如图甲,点M是直线BC上的一个动点,连接AM,OM,是否存在点M使AM+OM最小,若存在,请求出点M的坐标,若不存在,请说明理由;
(3)如图乙,过点P作PF⊥BC,垂足为F,过点C作CD⊥BC,交x轴于点D,连接DP交BC于点E,连接CP.设△PEF的面积为S1,△PEC的面积为S2,是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐1】定义:对于抛物线
,把它在
轴下方的部分图形作关于
轴的轴对称图形,所得的图形称为
的“
型曲线”.如图为
的“
型曲线”,与
轴的交点为
,
,与
轴的交点为
,与对称轴的交点为
,有
轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/4569436c-c10c-4597-8087-b67b16a90a4e.png?resizew=154)
(1)求
的值.
(2)若直线
与
的“
型曲线”有且只有三个公共点,求
的值.
(3)在
的“
型曲线”是否存在点
,使得
,若存在,求点
的横坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f3b964ba49f9188301e9e121a7169ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2fbc873eda1f2acaef6e4de3e0b806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd86d4b393eef4cc677bb4a3500766d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/4569436c-c10c-4597-8087-b67b16a90a4e.png?resizew=154)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5848d7371b15965ab8990329fe04bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2fbc873eda1f2acaef6e4de3e0b806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2fbc873eda1f2acaef6e4de3e0b806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5b64173b76e986eb7cc8b6705773ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,已知二次函数
的图象与
轴交于
和
两点,与
轴交于
,对称轴为直线
,连接
,在线段
上有一动点
,过点
作
轴的平行线交二次函数的图象于点
,交
轴于点
,
(2)请你从以下三个选项中,任选一个为条件,另一个作结论,组成一个真命题,并证明.
①
的横坐标为
;②
与
相似;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5a058bcd17503a9009fe19a2d487fd.png)
(3)若动点
横坐标记为
,
的面积记为
,
的面积记为
,且
,写出
与
的函数关系,并判断
是否有最大值,若有请求出;若没有请说明理由.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15af0278feed30c7c6ca0c6788406976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af86a954dad92dfc94f837955f82718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)请你从以下三个选项中,任选一个为条件,另一个作结论,组成一个真命题,并证明.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec71f16aa557d420d6286b7747b2cb05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b886208c6c2df19b984f2631e1c996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5a058bcd17503a9009fe19a2d487fd.png)
(3)若动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e817a54942ebf021a2967ff0c51a8111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8045b729b7f257861057191a8a2388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9aa018efd1e33d9e901637f3fd4fda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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(0.4)
【推荐1】如图1,抛物线
交
轴于
两点(
在
的左边),与
轴交于
点,
是抛物线上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/7d75d86c-c624-4011-af02-025cf5cadb45.jpg?resizew=353)
(1)直接写出
三点的坐标:
______,
______,
______;
(2)若点
到直线
的距离等于
,当
为何值时,这样的
点有且仅有3个;
(3)如图2,当
在第二象限时,连接
,若
,求
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0781a9acdedd45dbdf6855f91ead86.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/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/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/7d75d86c-c624-4011-af02-025cf5cadb45.jpg?resizew=353)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.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/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eb0c11e4b7aa9030a6691aee35eed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55e10927127ae609befa165d8aa4cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐2】阅读材料:一元二次方程ax2+bx+C=0(a≠0),当△≥0时,设两根为x1,x2,则两根与系数的关系为:x1+x2=
;x1•x2=
.
应用:(1)方程x2﹣2x+1=0的两实数根分别为x1,x2,则x1+x2= ,x1•x2= .
(2)若关于x的方程x2﹣2(m+1)x+m2=0的有两个实数根x1,x2,求m的取值范围;
(3)在(2)的条件下,若满足|x1|=x2,求实数m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4959731b39859941d702e680b554b707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b246aa3b56becc905d3fb64c6d5ec4a.png)
应用:(1)方程x2﹣2x+1=0的两实数根分别为x1,x2,则x1+x2= ,x1•x2= .
(2)若关于x的方程x2﹣2(m+1)x+m2=0的有两个实数根x1,x2,求m的取值范围;
(3)在(2)的条件下,若满足|x1|=x2,求实数m的值.
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【推荐1】如图(1),Rt△AOB中,∠A=90°,∠AOB=60°,OB=2
,∠AOB的平分线OC交AB于C,过O点作与OB垂直的直线ON.动点P从点B出发沿折线BC﹣CO以每秒1个单位长度的速度向终点O运动,运动时间为t秒,同时动点Q从点C出发沿折线CO﹣ON以相同的速度运动,当点P到达点O时P、Q同时停止运动.
(1)求OC、BC的长;
(2)当t=1时,求△CPQ的面积;
(3)当P在OC上Q在ON上运动时,如图(2),设PQ与OA交于点M,当t为何值时,△OPM为等腰三角形?求出所有满足条件的t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求OC、BC的长;
(2)当t=1时,求△CPQ的面积;
(3)当P在OC上Q在ON上运动时,如图(2),设PQ与OA交于点M,当t为何值时,△OPM为等腰三角形?求出所有满足条件的t值.
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420558070063104/2421009698209792/STEM/8703dbfc23bb409ebd4c7d99f78bf0ac.png?resizew=365)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,
,D,E分别是射线
上的动点,连接
,将
绕点D逆时针旋转
得到
,连接
.
(1)如图1,当
时,求证:
.
(2)如图2,当
时,(1)中的结论是否成立?若成立,请说明理由;若不成立,请写出新的结论并证明.
(3)若
,请直接写出以A,D,E,F为顶点的四边形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17487118ab7a90fc8c91bf0870f3289e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/9c09cc8d-39fb-431a-8fd3-563c8b1516be.png?resizew=342)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5f374024260b8d0083f41c2bb825b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7651ee0f30f2315efe8cdff03663c1a1.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64efdd1318ff89bd491890be48b7273.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c486a49e0608f1cde38e7ee15765be1.png)
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