阅读下列一段文字,然后回答下列问题.已知在平面内两点
,
,其两点间的距离
.同时,当两点所在的直线在坐标轴或平行于坐标轴或垂直于坐标轴时,两点间距离公式可简化为
或
.
(1)已知
,
,试求A、B两点间的距离;
(2)已知一个三角形各顶点坐标为
、
、
,请判定此三角形的形状,并说明理由.
(3)已知
,在x轴上是否存在一点P,使
为等腰三角形,若存在请直接写出点P的坐标;若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b8ae26c446d54f456a4f9b2f28d091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4e94463a0f22990789c5494916e844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea85462de4f0c3de7b8f47242a3102b.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c21dde2ad1e31c337bfb78c810ccb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07bddd9bebc06909947a3f429ce3348.png)
(2)已知一个三角形各顶点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c80eabaf101288433b3b9e92a4805a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cba284d675a3028d7a8d54f1f8ae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f63f0bdeade1904c747ec9ef0ff3443.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
21-22八年级上·山东济南·期中 查看更多[10]
山东省济南市市中区济南育英中学2021-2022学年八年级上学期期中数学试题山东省济南市市中区2021-2022学年八年级上学期期中数学试题(已下线)专题14 已知两点坐标求两点距离-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(人教版)湖南省常德市安乡县2022-2023学年八年级下学期期末数学试题湖南省常德市安乡县2022-2023学年八年级上学期期末数学试题陕西省西安市第三中学2023-2024学年八年级上学期期中数学试题陕西省西安市经开第一学校2023-2024学年八年级上学期期中数学试题广东省佛山市2023-2024学年八年级上学期期末模拟数学试题湖南省益阳市安化县梅城镇中学2023-2024学年九年级上学期开学考试数学试题(已下线)四川省成都市教育科学研究院附属学校(成都市天府实验学校)2023-2024学年八年级上学期12月月考数学试题
更新时间:2021-11-21 15:12:59
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解答题-问答题
|
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【推荐1】(1)问题再现:学习二次根式时,老师给同学们提出了一个求代数式最小值的问题,如,“求代数式
的最小值”.小强同学发现
可看作两直角边分别为x和2的直角三角形斜边长,
可看作两直角边分别是12﹣x和3的直角三角形的斜边长.于是构造出如图所示,将问题转化为求线段AB的长,进而求得
的最小值是 .
(2)类比迁移:已知a,b均为正数,且a+b=4.求
的最小值 .
(3)方法应用:已知a,b均为正数,且
,
,
是三角形的三边长,求这个三角形的面积(用含a,b的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddc5685e76ec03934608f25c5cbf7f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90216f30736912b12d5ad16bb4264a28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b48766030b5e3d6e6a92755caec76ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddc5685e76ec03934608f25c5cbf7f1.png)
(2)类比迁移:已知a,b均为正数,且a+b=4.求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46e0d15bef6a35dd7b61fe1a72dbe2.png)
(3)方法应用:已知a,b均为正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e335a4da56429bb3dc8fdc9346a57118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d6e42f1f268cf243dd8ea15943a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cfc5a15e1599c18f58b179a77509f0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953685699010560/2956075216363520/STEM/f09d6975-730c-48b2-bcb6-a0f6c81c12ce.png?resizew=193)
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【推荐2】正方形
中,M是
上的一点,N是
上的一点,且
,
于P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/b7d81d5c-1ddb-492b-aa6b-636586a47462.png?resizew=145)
(1)若
,
,求
的长;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dfb4ae0774582f5a5716da38cc176d.png)
(3)直接写出
____________
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f94eac43dd497db0d8ed8727a8e0cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2532735440c19cd96034ea2956d18f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/b7d81d5c-1ddb-492b-aa6b-636586a47462.png?resizew=145)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231e0e84306bd7a86028fb10f9b66820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a289ff1d74fdf11c252f5a139b79cf59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dfb4ae0774582f5a5716da38cc176d.png)
(3)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824f7c744ddae9cc38e12a035179e9f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b57d97f4ebb5eaf80c8d142ecfcf78.png)
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解答题-计算题
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【推荐1】已知点
,则
之间的距离为
.
(1)若已知点
,求线段
的长.
(2)在(1)的条件下,若存在点
,请判断
的形状,并说明理由.
(3)若
,求当x为何值时,y取最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb1121d4ae42fb87bbb32f7abe00ba6.png)
(1)若已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45af2cb451c214b986c6a63cab0b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在(1)的条件下,若存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec7ce50749b62afd5ee592fa294bb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e88fc630c7c5c97e3e21e9cf961b0d2.png)
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名校
【推荐2】在平面直角坐标系中,点
.若点C为x轴上的一个动点,点D为y轴上的另一个动点
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/3fad5e8c-f420-4bc1-b846-be9d40e9da03.png?resizew=397)
(1)当
的面积等于4时,求点D的坐标.
(2)若
为等腰三角形,求点C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdee7083e27be40f92b6ac89e03aea2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/3fad5e8c-f420-4bc1-b846-be9d40e9da03.png?resizew=397)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
【推荐1】已知:如图,在△ABC中,AC=9,AB=12, BC=15,AD是BC边上的高.
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352905704914944/2353598456512512/STEM/7c935c169bb54a54a137a51de5638738.png?resizew=145)
(1)求证:△ABC是直角三角形;
(2)求AD的长.
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352905704914944/2353598456512512/STEM/7c935c169bb54a54a137a51de5638738.png?resizew=145)
(1)求证:△ABC是直角三角形;
(2)求AD的长.
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【推荐2】已知:在△ABC中,∠A,∠B,∠C的对边分别是a,b,c,三边分别为下列长度,判断该三角形是不是直角三角形,并指出哪一个角是直角.
(1)a=
,b=2
,c=
;
(2)a=5,b=7,c=9;
(3)a=2,b=
,c=
;
(4)a=5,b=2
,c=1.
(1)a=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(2)a=5,b=7,c=9;
(3)a=2,b=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
(4)a=5,b=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
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【推荐1】已知:如图,直线
与
轴交于点
,与
轴交于点
,平面内有一点
,直线
与
轴交于点
.直线
的解析式记作
,直线
解析式记作
,直线
与直线
相交于点
.
的面积;
(2)当
______时,
;
(3)在
轴上有一动点
,使得
为等腰三角形,请直接写出
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/4771434a43ef4202325593a9d6931abb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9412b2f37124a6f9c10d29623e3725d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779dfa24f655ebf82cfaeeeb25cb2524.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd1ae36724363d23865f9bc2fc6ecc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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【推荐2】 等腰三角形
中,一腰
上的中线
把三角形的周长分为
和
两部分,求此三角形的腰和底边的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc78a3b284e57c70528495772abb6af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be94b5554fa800df51f118f9334d210.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/a61f3ffd-aa4a-4678-98ee-0f015a6a0258.png?resizew=147)
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