综合与探究
抛物线
与x轴交于
两点(A点在B点左边),与y轴交于C点,已知
.
![](https://img.xkw.com/dksih/QBM/2022/11/15/3110376578637824/3111461159862272/STEM/d33041bcf80d4dc6936029f87754268c.png?resizew=142)
(1)求
两点的坐标;
(2)求抛物线的解析式;
(3)在抛物线上是否存在一点P,使
的内心在x轴上?若存在,求出P点坐标;若不存在,请说明理由.
抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693482367cd9bf1211bf8a90dedb9e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051ef731f266dbf72ccb19dc222bf2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84acb42778406c1a60d818f6ca760366.png)
![](https://img.xkw.com/dksih/QBM/2022/11/15/3110376578637824/3111461159862272/STEM/d33041bcf80d4dc6936029f87754268c.png?resizew=142)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051ef731f266dbf72ccb19dc222bf2d.png)
(2)求抛物线的解析式;
(3)在抛物线上是否存在一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
18-19九年级上·广西河池·期末 查看更多[4]
广西河池市宜州区2018-2019学年九年级上学期期末数学试题(已下线)专题16 直线与圆的位置关系(专题强化-提高)-2021-2022学年九年级数学上册期中期末考点大串讲(沪科版)山西省忻州市五台县2022-2023学年九年级上学期期中考试数学试卷广东省湛江市雷州市新南方学校2022-2023学年九年级上学期数学期中试卷
更新时间:2022-11-17 10:26:50
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【推荐1】某文具零售店准备从批发市场选购A、B两种文具,批发价A种为12元/件,B种为8元/件.若该店零售A、B两种文具的日销售量y(件)与零售价x(元/件)均成一次函数关系.(如图)
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(2)该店计划这次选购A、B两种文具的数量共120件,所花资金不超过1200元,并希望全部售完获利不低于178元,若按A种文具日销售量6件和B种文具每件可获利1元计算,则该店这次有哪几种进货方案?
(3)若A种文具的零售价比B种文具的零售价高4元/件,求两种文具每天的销售利润(元)与A种文具零售价x(元/件)之间的函数关系式,并说明A、B两种文具零售价分别为多少时,每天销售的利润最大?
(1)求y与x的函数关系式;
(2)该店计划这次选购A、B两种文具的数量共120件,所花资金不超过1200元,并希望全部售完获利不低于178元,若按A种文具日销售量6件和B种文具每件可获利1元计算,则该店这次有哪几种进货方案?
(3)若A种文具的零售价比B种文具的零售价高4元/件,求两种文具每天的销售利润(元)与A种文具零售价x(元/件)之间的函数关系式,并说明A、B两种文具零售价分别为多少时,每天销售的利润最大?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/4e741582-c5d4-42e7-8517-4e68885f9cf8.png?resizew=161)
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【推荐2】已知一次函数
与反比例函数
的图象相交于
和
两点,其中有一个交点
的横坐标是3.
的值;
(2)求
两点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24009f2af0b8b417c29162418f07206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff283f2c9ba34347f7c3b0d6c0d32d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5725e3e4eb05b32563b4ee1d473756c.png)
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【推荐1】如图,在平面直角坐标系xOy中,抛物线y=ax2+bx-3与直线y=-x-1交于点A(-1,0),B(m,-3),点P是线段AB上的动点.
(1)① m= ;
② 求抛物线的解析式;
(2)过点P作直线l垂直于x轴,交抛物线y=ax2+bx-3于点Q,求线段PQ的长最大时,点P的坐标
(1)① m= ;
② 求抛物线的解析式;
(2)过点P作直线l垂直于x轴,交抛物线y=ax2+bx-3于点Q,求线段PQ的长最大时,点P的坐标
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/e418e9a8-214f-4d7c-b82c-bbbd3d0fe51b.png?resizew=130)
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【推荐2】如图,已知二次函数
的图象与x轴相交于
两点,与y轴相交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/3130ce7b-24db-4699-9767-69587d89b732.png?resizew=195)
(1)求这个二次函数的解析式;
(2)若P是第四象限内这个二次函数的图象上任意一点,连接
,作
轴于点H,与
交于点M,连接
.当
是以
为一腰的等腰三角形时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ab36b5a6a8376b45bb562e36fc085c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/3130ce7b-24db-4699-9767-69587d89b732.png?resizew=195)
(1)求这个二次函数的解析式;
(2)若P是第四象限内这个二次函数的图象上任意一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fbd9b5e5d8be69373850d7faebdaf1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐1】如图,在平面直角坐标系中,O为坐标原点,抛物线
与x轴的另一交点为点A,与y轴垂直的直线l交该抛物线于点B和点C,设点B的纵坐标为n.
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(1)求线段
的长.
(2)当函数值y随x增大而增大时,直接写出自变量x的取值范围.
(3)当线段
的长小于
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(1)求线段
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(2)当函数值y随x增大而增大时,直接写出自变量x的取值范围.
(3)当线段
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【推荐2】已知二次函数当
时取最小值
,且抛物线图像经过点
.
(1)求此抛物线的函数表达式;
(2)求抛物线与
轴的交点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
(1)求此抛物线的函数表达式;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】解答下列问题
(1)【尺规作图】如图
,利用无刻度直尺和圆规,作出
的内心
;(保留作图痕迹)
(2)【习题再现】完成原习题;(教材
第
题)如图
,
是
的内心,
的延长线交
的外接圆于点
.
和
相等吗?为什么?
(3)【逆向思考】如图
,
为
内一点,
的延长线交
的外接圆于点
.若
,求证:
为
的内心.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/652fe454-cde2-4451-918f-7d9289642cfc.png?resizew=306)
(1)【尺规作图】如图
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(2)【习题再现】完成原习题;(教材
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1214384851f1659bd978ad218ad283db.png)
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(3)【逆向思考】如图
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb119694a1b3f5d6baac9d627f4e6ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
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【推荐2】综合与实践
含30°角的三角板与量角器按如图1所示方式放置,直角边
与半圆O相切于点A,
,
交半圆于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/d244541d-8536-475b-ab0e-10d61a319713.png?resizew=516)
数学思考:
(1)填空:在图1中,
的长为
.
深入探究:
(2)如图2,直尺上边沿与
重合,将直尺从图2所示位置开始绕点A逆时针转动,如图3所示,上边沿与半圆O交于另一点P,连接
,
.量角器上,A,B两点的读数分别为
,
.
①当点P在这块量角器上的读数是
时,求
的度数.
②如图4,当
经过
的内心时,求直尺上边沿在量角器上扫过的面积S.
含30°角的三角板与量角器按如图1所示方式放置,直角边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138cf86f8dee9c7a96803dbe949112d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/d244541d-8536-475b-ab0e-10d61a319713.png?resizew=516)
数学思考:
(1)填空:在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c255bed34ed3d3d34d652fa4bf3136f2.png)
深入探究:
(2)如图2,直尺上边沿与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa21f33a1eb2bccdca7aeecf359e657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e1dcdc9d50fe147e3924ce30bba519.png)
①当点P在这块量角器上的读数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ec709a974b61f0f0a2565d4efe0f58.png)
②如图4,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
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