如图(1),Rt△AOB中,∠A=90°,
,OB=2
,∠AOB的平分线OC交AB于C,过
作与
垂直的直线
.动点
从点
出发沿折线
以每秒1个单位长度的速度向终点
运动,运动时间为t秒,同时动点Q从点C出发沿折线
以相同的速度运动,当
点到达
点时,
同时停止运动.
(1)OC= ,BC= ;
(2)设△CPQ的面积为S,求S与t的函数关系式;
(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
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/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755091f2ac4e61c30fbc2a7ff3647d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e0aaeabbf48c53f325dd1182b7b48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
(1)OC= ,BC= ;
(2)设△CPQ的面积为S,求S与t的函数关系式;
(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
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
17-18八年级下·江西抚州·阶段练习 查看更多[15]
江西省崇仁县第一中学2017-2018学年八年级下学期第一次月考数学试题上海市黄浦区上海民办永昌学校2019-2020学年八年级上学期第二次月考数学试题(已下线)期末检测押题卷(二)-2020-2021学年八年级数学下学期期末专项复习(人教版)广东省北大附中深圳南山分校2020-2021学年八年级下学期期中数学试题(已下线)第19章 几何证明(压轴题专练)-2021-2022学年八年级数学上学期期中期末考试满分全攻略(沪教版)四川省成都市郫都区郫都区西川汇锦都学校2021-2022学年八年级下学期3月月考数学试题(已下线)专题04 含30度角的直角三角形-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(北师大版)(已下线)专题02 等腰三角形与勾股定理综合-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(北师大版)(已下线)难点特训(一)和三角形的证明有关的压轴大题-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(北师大版)广东省清远市佛冈县汤塘中学2022-2023学年八年级下学期期中数学试题 广东省清远市阳山县南阳中学2022-2023学年八年级下学期期中数学试题广东省佛山市顺德区德胜学校2021-2022学年八年级下学期第一次月考数学试题(已下线)第1章 三角形的证明易错(11个考点50题专练)-2023-2024学年八年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(北师大版)(已下线)第1章 三角形的证明压轴大题(9个考点30题专练)-2023-2024学年八年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(北师大版)(已下线)期末复习(易错题60题23个考点)-2023-2024学年八年级数学下学期期末考点大串讲(北师大版)
更新时间:2021-08-29 00:55:44
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【推荐1】如图,中国海监船46,49在距离钓鱼岛
海里处,已知两船的航速如下表所示:
其中,一节等于
海里/时,如果海监46先以经济航速行驶若干小时后以最大航速沿图中箭头方向航线行驶至钓鱼岛,共行驶时间
小时,海监49比海监46迟出发半小时,以最大航速沿同一路线驶向钓鱼岛.问:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/511744d1-acb6-4c6d-b255-bc8973b3b1ba.png?resizew=211)
(1)两船谁先到达钓鱼岛?说明理由;
(2)海监46经济航行和最大航速航行各多少小时?
(3)设海监46航行时间为
,求两海监船之间的距离
与
之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc011a0862d1f780331f1e9f8a467a9.png)
最大航速 | 经济航速 | |
海监46 | 16节 | 14节 |
海监49 | 15.2节 | 14.5节 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/511744d1-acb6-4c6d-b255-bc8973b3b1ba.png?resizew=211)
(1)两船谁先到达钓鱼岛?说明理由;
(2)海监46经济航行和最大航速航行各多少小时?
(3)设海监46航行时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
【推荐2】如图,在等腰直角三角形
中,
,
.点P(不与A、B重合)从点A出发,沿
方向以
的速度向终点B运动,在运动过程中,
交射线
于点Q,以线段
为边作等腰直角三角形
且
(点B、R位于
两侧).设
与
重叠部分图形的面积为
,点P的运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/314ac4c1-786b-45fb-a05e-b81b72dc32db.png?resizew=198)
(1)当点Q与点C重合时,
______.
(2)当点R落在边
上时,求t的值.
(3)求S与t之间的函数关系式.
(4)当点R与
的顶点C的连线平分
面积时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e7c8586eef5596aef5fb5160a196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb147bedf12b89828deae1f69afc6f98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592053410fe89d92c3771ed67bf3aff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5647a2693bc8358ae55ce56e63d09de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365d66326cb96650d10715ff76403063.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9091bc1886a3fd3d17160b2d41ded.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/314ac4c1-786b-45fb-a05e-b81b72dc32db.png?resizew=198)
(1)当点Q与点C重合时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c084dc62a6c09bcccc424c48e1b0e0a.png)
(2)当点R落在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(3)求S与t之间的函数关系式.
(4)当点R与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐3】△ABC和△DEF的顶点A与D重合,已知∠B=90°,∠BAC=30°,BC=6,∠FDE=90°,DF=DE=4.
![](https://img.xkw.com/dksih/QBM/2018/3/2/1893726957428736/1897699865214976/STEM/b58bd089ad7c474d92b1bcb989e320d2.png?resizew=402)
(1)如图①,EF与边AC、AB分别交于点G、H,且FG=EH.设
,在射线DF上取一点P,记:
,连接CP设△DPC的面积为y,求y关于x的函数解析式,并写出定义域;
(2)在(1)的条件下,求当x为何值时PC//AB;
(3)如图②,先将△DEF绕点D逆时针旋转,使点E恰好落在AC边上,在保持DE边与AC边完全重合的条件下,使△DEF沿着AC方向移动
当△DEF移动到什么位置时,以线段AD、FC、BC的长度为边长的三角形是直角三角形.
![](https://img.xkw.com/dksih/QBM/2018/3/2/1893726957428736/1897699865214976/STEM/b58bd089ad7c474d92b1bcb989e320d2.png?resizew=402)
(1)如图①,EF与边AC、AB分别交于点G、H,且FG=EH.设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23c940ada0a7d1944cd05affe598a9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559c99f0bd01887bf6799078e3b75963.png)
(2)在(1)的条件下,求当x为何值时PC//AB;
(3)如图②,先将△DEF绕点D逆时针旋转,使点E恰好落在AC边上,在保持DE边与AC边完全重合的条件下,使△DEF沿着AC方向移动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
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较难
(0.4)
【推荐1】已知,
是等边三角形,
.
(1)观察猜想:
如图1,点
是
边上一点,
,
交
的外角平分线于点
,求线段
,
,
之间的数量关系.小明发现,过点
作
的平行线交
于点
,容易发现线段
,
,
之间的数量关系是_________;
(2)类比探究:
如图2,若点
在
的延长线上,其他条件不变,(1)中的结论是否仍然成立?若成立,请给予证明;若不成立,写出此时
,
,
之间的数量关系,并说明理由;
(3)解决问题:
如图3,过点
作
于点
,点
是直线
上一点,以
为边,在
的下方作等边
,连接
,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/909174bb-e427-4b20-a03b-2e5027d7b88a.png?resizew=527)
(1)观察猜想:
如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)类比探究:
如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)解决问题:
如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
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【推荐2】问题背景:
(1)如图,
中,若
,
,
,则利用勾股定理,可以直接算出AB的长=______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/710d8d64-8d7c-47df-8fbb-5d3fe25da208.png?resizew=136)
尝试运用:
(2)如图,在(1)的条件下,以AB为边作等边
,(O、C在AB异侧)连OC,求OC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/9e53102f-f714-4dd6-8f2e-7e61dabcbf05.png?resizew=150)
拓展创新:
(3)如图,
,点A、B分别在射线OP,OQ上,
,以AB为边作等边
(O、C在AB异侧),过C作
于D,作
于E,(
,
),若
,求
的值.(用含n的代数式表示)
(1)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba1df94176a1f769c7a0a12bf357fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/710d8d64-8d7c-47df-8fbb-5d3fe25da208.png?resizew=136)
尝试运用:
(2)如图,在(1)的条件下,以AB为边作等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/9e53102f-f714-4dd6-8f2e-7e61dabcbf05.png?resizew=150)
拓展创新:
(3)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81966a1b8c376ed64e8238b7794f439c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9bbbcd5b57c28916f0a737451d5051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3c38ae02d2252c98a3f648c409d286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3435e2fcc05f6429aa06a5705388d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dbf7aae1fcef0349b7f9972dffd36ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273a4e323759b417812470404fade32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75d2720e8ddaff4229bf850ee07fbab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ae4d1366da853e83cbe41668dc992f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/56cdd849-0db3-43b1-a032-3aa66804d703.png?resizew=149)
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【推荐1】△ABD中∠BAD=90°,点C为△ABD外的一点,有∠ADC+∠ABC=180°,∠ACB=∠ABD=45°,
(1)求证:BC+CD=
AC;
(2)若△ABC关于直线AB的对称图形为△ABM,连接DM,试探究
,
,
三者之间满足等量关系,并证明你的结论.
(1)求证:BC+CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)若△ABC关于直线AB的对称图形为△ABM,连接DM,试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3bf347ee3990485027d58cb0805ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cee5dc332780d6324ab2290302d0e92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98077c7f90082d0de9213c24c54de6fe.png)
![](https://img.xkw.com/dksih/QBM/2020/11/29/2603211426324480/2604649935585280/STEM/63e7aed321f14120b66232f6339e92ac.png?resizew=200)
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【推荐2】如图,抛物线
与x轴交于
,B两点,与y轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/bf1d5070-0ecd-49f7-abb3-d0aff1a93341.png?resizew=332)
(1)求该抛物线的解析式;
(2)如图(1),点P是线段
上的一动点,过点P作
轴交抛物线于点Q,连接
,若
平分
,求点P的坐标;
(3)如图(2),过A,B,C三点作
,直线
交
于点M,N,交抛物线于点E,F.
若
,求t的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/bf1d5070-0ecd-49f7-abb3-d0aff1a93341.png?resizew=332)
(1)求该抛物线的解析式;
(2)如图(1),点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b2fb47382e76af829559a75b48fca.png)
(3)如图(2),过A,B,C三点作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4fa231bf9a41a352da96db3d61d627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7bb49f5e84341e29ddd0eba6e7eaa72.png)
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【推荐1】如图1,点
在正方形
的对角线
上,
,垂足为
,垂足为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/7f47323c-84ca-4659-b225-7bb2c7829ba3.png?resizew=438)
(1)求证:四边形
是正方形.
(2)如图2,将正方形
绕点
顺时针方向旋转
,试探究线段
与
之间的数量关系,并说明理由.
(3)如图3,正方形
在旋转过程中,当
三点在同一条直线上时,延长
交
于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ddc47cce2e80eefc150192061c3b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f37632add76883bd08b68c1b5099d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/7f47323c-84ca-4659-b225-7bb2c7829ba3.png?resizew=438)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
(2)如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec18b43a3d835d6da87689949670d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(3)如图3,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca382790c69e17b81574b8c2ac2f99d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f8833693501417d10d7d5150b19db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】综合与实践
综合与实践课上,老师让同学们以“三角板的平移”为主题开展数学活动.
操作一:将一副等腰直角三角板两斜边重合,按图1放置;
操作二:将三角板
沿
方向平移(两三角板始终接触)至图2位置.
根据以上操作,填空:
①图1中四边形
的形状是__________;
②图2中
与
的数量关系是__________;四边形
的形状是__________.
(2)迁移探究
小航将一副等腰直角三角板换成一副含
角的直角三角板,继续探究,已知三角板
边长为
,过程如下:
将三角板
按(1)中的方式操作,如图3,在平移过程中,四边形
的形状能否是菱形,若不能,请说明理由,若能,请求出
的长.
(3)拓展应用
在(2)的探究过程中;
当
为等腰三角形时,请直接写出
的长;
综合与实践课上,老师让同学们以“三角板的平移”为主题开展数学活动.
操作一:将一副等腰直角三角板两斜边重合,按图1放置;
操作二:将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
根据以上操作,填空:
①图1中四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ecdb698bd9d00d684430e911e4d99d.png)
(2)迁移探究
小航将一副等腰直角三角板换成一副含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf8111bf36bfb6420a734cc51560e9c.png)
将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ecdb698bd9d00d684430e911e4d99d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
(3)拓展应用
在(2)的探究过程中;
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e95b09cec34e6dcdccaaddbc517ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
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【推荐3】定义:角内部的一点P到角两边的距离分别为m、n(
),将m与n的比值叫做点P关于这个角的“距离比”,记作k,其中
;若“距离比”
,则称点P为这个角的“平衡点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/71473bcb-fa22-44b2-930c-d84037a432de.png?resizew=469)
(1)下列四边形对角线的交点一定是这个四边形内角的“平衡点”的是__________(填序号)
①平行四边形 ②矩形 ③菱形
(2)在平面直角坐标系
中,四边形
是平行四边形,
,对角线
相交于点P,
,
,垂足分别为M、N;
①如图,点C在第一象限,且坐标为
,求点P关于
的“距离比”k的值;
②若点P为
的“平衡点”,且点B的纵坐标为7,求点C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870c36161f465fc992534b5fc3777f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289daf9dd78ecf701c0582c8c7c4ba1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/71473bcb-fa22-44b2-930c-d84037a432de.png?resizew=469)
(1)下列四边形对角线的交点一定是这个四边形内角的“平衡点”的是__________(填序号)
①平行四边形 ②矩形 ③菱形
(2)在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3793d98d60080b414ac8acbb975e048f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3314abcc3dc248c7b8b84c1310b854db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a69f6a208dd6671c46271b78430d79b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538f56ba567968e0323bb5c309f0b000.png)
①如图,点C在第一象限,且坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238f0ea276a00ae8d681ce00cc11c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
②若点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
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