我们定义:如果一个三角形一条边上的高等于这条边,那么这个三角形叫做“等高底”三角形,这条边叫做这个三角形的“等底”.
【概念理解】
(1)如图(a),在
的方格纸中,将每个小正方形的顶点称为格点,线段
的端点都在格点上,请在所给的方格图中画出
,使
为“等高底”三角形,且点
在格点上;(画出一个即可)
(2)如图(b),在
中,
,试判断
是否是“等高底”三角形,并请说明理由;
【应用拓展】
(3)如图(c),在
中,点
的坐标为
,点
在射线
上,若
是“等高底”三角形,求点
的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/792454f4-c89f-4c92-9e51-1d7a078cbe88.png?resizew=560)
【概念理解】
(1)如图(a),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d009739b5b5362c7902eeeada94adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图(b),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9bf2686b36e9ce41a5ce23d3051827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【应用拓展】
(3)如图(c),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed8d4fd5c2cda8b9bea800b06cfa7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
更新时间:2023-06-15 15:55:21
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】某校九年级学生小丽、小强和小红到某超市参加了社会实践活动,在活动中他们参与了某种水果的销售工作,已知该水果的进价为8元/千克,下面是他们在活动结束后的对话.
小丽:如果以10元/千克的价格销售,那么每天可售出100千克.
小强:如果以12元/千克的价格销售,那么每天可售出80千克.
小红:通过调查验证,我发现每天的销售量
(千克)与销售单价
(元)之间存在一次函数关系.
小强:我发现每天的销售量在70千克至100千克之间.
那么当销售单价为何值时,该超市销售这种水果每天获取的利润为320元?
小丽:如果以10元/千克的价格销售,那么每天可售出100千克.
小强:如果以12元/千克的价格销售,那么每天可售出80千克.
小红:通过调查验证,我发现每天的销售量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
小强:我发现每天的销售量在70千克至100千克之间.
那么当销售单价为何值时,该超市销售这种水果每天获取的利润为320元?
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
真题
名校
【推荐2】增强公民的节约意识,合理利用天然气资源,某市自1月1日起对市区民用管道天然气价格进行调整,实行阶梯式气价,调整后的收费价格如表所示:
(1)若甲用户3月份的用气量为60m3,则应缴费 元;
(2)若调价后每月支出的燃气费为y(元),每月的用气量为x(m3),y与x之间的关系如图所示,求a的值及y与x之间的函数关系式;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/16246f69-d158-4a81-871b-ae6a25b18eac.jpg?resizew=144)
(3)在(2)的条件下,若乙用户2、3月份共用1气175m3(3月份用气量低于2月份用气量),共缴费455元,乙用户2、3月份的用气量各是多少?
每月用气量 | 单价(元/m3) |
不超出75m3的部分 | 2.5 |
超出75m3不超出125m3的部分 | a |
超出125m3的部分 | a+0.25 |
(2)若调价后每月支出的燃气费为y(元),每月的用气量为x(m3),y与x之间的关系如图所示,求a的值及y与x之间的函数关系式;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/16246f69-d158-4a81-871b-ae6a25b18eac.jpg?resizew=144)
(3)在(2)的条件下,若乙用户2、3月份共用1气175m3(3月份用气量低于2月份用气量),共缴费455元,乙用户2、3月份的用气量各是多少?
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
真题
【推荐3】某发电厂共有6台发电机发电,每台的发电量为300万千瓦/月.该厂计划从今年7月开始到年底,对6台发电机各进行一次改造升级.每月改造升级1台,这台发电机当月停机,并于次月再投入发电,每台发电机改造升级后,每月的发电量将比原来提高20%.已知每台发电机改造升级的费用为20万元.将今年7月份作为第1个月开始往后算,该厂第x(x是正整数)个月的发电量设为y(万千瓦).
(1)求该厂第2个月的发电量及今年下半年的总发电量;
(2)求y关于x的函数关系式;
(3)如果每发1千瓦电可以盈利0.04元,那么从第1个月开始,至少要到第几个月,这期间该厂的发电盈利扣除发电机改造升级费用后的盈利总额ω1(万元),将超过同样时间内发电机不作改造升级时的发电盈利总额ω2(万元)?
(1)求该厂第2个月的发电量及今年下半年的总发电量;
(2)求y关于x的函数关系式;
(3)如果每发1千瓦电可以盈利0.04元,那么从第1个月开始,至少要到第几个月,这期间该厂的发电盈利扣除发电机改造升级费用后的盈利总额ω1(万元),将超过同样时间内发电机不作改造升级时的发电盈利总额ω2(万元)?
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图在平面直角坐标系中,抛物线
与
轴交于点
和点
(点
在点
的左侧),与
轴交于点
,经过点
的直线与抛物线交于点
,与
轴交于点
.
的坐标;
(2)点
是
轴下方抛物线上的一个动点,使
的面积为
,求点
的坐标.
(3)点
是线段
上一动点,点
是线段
上一动点,且
,请直接写出
的最小值为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de540364449219af5e2780977004a83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586d6b7a54a256cb0ecd0ea2d8262f6d.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae79aa5fe83e708cb832b6893a15c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a44d321ae2abfc4e566933a92637d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3efdc45b50e82162f4fc35ddf2cecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34101f186022b16edbd8e6a7aa38ef2f.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐2】已知如图,在△ABC中,AB=4, AC=2,∠BAC=60°,点D为AB的中点,E是AD上一点,F是CA延长线上一点,BE=CF,连结DF, G是DF的中点,设AE=x,△AGD的面积为y.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/94f461b3-4eb5-4a63-b527-c0d4c0cb524a.png?resizew=170)
(1)求证:△ABC是直角三角形.
(2)判断CE与AG的数量关系,并说明理由.
(3)求y关于x的函数关系式,并求出当AG:AF=
时y的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/94f461b3-4eb5-4a63-b527-c0d4c0cb524a.png?resizew=170)
(1)求证:△ABC是直角三角形.
(2)判断CE与AG的数量关系,并说明理由.
(3)求y关于x的函数关系式,并求出当AG:AF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0c7d5dd60e59b6f170f0f88abb3e0b.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】【综合与实践】
老师让同学们以“两个大小不等的等腰直角三角板的直角顶点重合,并让一个三角板固定,另一个绕直角顶点旋转”为主题开展数学活动.如图1,
和
都是等腰直角三角形,
,点D,E分别在边
,
上,连接
,点M,P,N分别为
,
,
的中点.试判断线段
与
的数量关系和位置关系.
甲小组发现:
,
.并进行了证明,下面的两个片段是截取的部分证明过程(片段前后证明过程已省略):
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/bcc125dc-86b3-4a50-be06-80017cdf9fa0.png?resizew=274)
【片段1】∵点P,M分别是
,
的中点,
,
.(理由1)
【片段2】
,
(理由2).
反思交流
(1)①填空:理由1:______________________;
理由2:______________________;
②图1中,
与
的位置关系是 .
(2)乙小组受到甲小组的启发,继续进行探究,把
绕点C逆时针方向旋转到如图2的位置.请判断
的形状并证明:
(3)两小组的同学继续探究:把
绕点C在平面内自由旋转,当
,
时,直接写出线段
长度的最大值.
老师让同学们以“两个大小不等的等腰直角三角板的直角顶点重合,并让一个三角板固定,另一个绕直角顶点旋转”为主题开展数学活动.如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
甲小组发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3835e6398d18d162afebc92cd2ae9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/bcc125dc-86b3-4a50-be06-80017cdf9fa0.png?resizew=274)
【片段1】∵点P,M分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473ce75253c6d7b339506dd736738cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a9356c9428c195f321356331c9adb9.png)
【片段2】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2ca4a5d8d697cf68d8c649df81490a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3df74e2bde40de559ae73c553be334a.png)
反思交流
(1)①填空:理由1:______________________;
理由2:______________________;
②图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)乙小组受到甲小组的启发,继续进行探究,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
(3)两小组的同学继续探究:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17fd4ce6a0ae735ba58c2c49bc2a7e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知:如图,
是边长为
的等边三角形,动点
、
同时从
、
两点出发,分别沿
、
方向匀速移动,它们的速度都是
,当点
到达点
时,
、
两点停止运动,设点
的运动时间
,解答下列各问题:
(1)求
的面积;
(2)当
为何值时,
是直角三角形?
(3)探究:是否存在某一时刻
,使四边形
的面积是
面积的八分之五?如果存在,求出
的值;不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/21c08705-9ed0-48e7-9240-307e6743e6fd.png?resizew=114)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
(3)探究:是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5b62ea69808e36e57db3cf2583f118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,已知
为圆
的直径,
是圆外一点,连结
交圆
于点
的平分线交半圆
于点
,且
,连结
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/7bde63d7-65c2-4832-a86a-df7f200ee776.png?resizew=497)
(1)求证:
;
(2)当
,且直径
时,求
的长;
(3)当
为直角三角形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade50955ef900314b05caebfe4144fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/7bde63d7-65c2-4832-a86a-df7f200ee776.png?resizew=497)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a6afb7772b3168bd1795e5918b10e0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f0dc17db5fcc83b204dc845447ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac117d79db75ce7f945bdc43c25b8d9.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,已知
中,
,
.点D是
所在平面内不与点A、C重合的任意一点,连接
,将线段
绕点D顺时针旋转α得到线段
,连接
、
.
(1)如图1,当
时,求证:
.
(2)当
时,请判断线段
与
之间的数量关系是_____,并仅就图2的情形说明理由.
(3)当
时,且
时,若
,
,点E在
上方,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/50a7f436-2711-49d2-a441-1342a83baf70.png?resizew=472)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,
为
边上一点,
,
,
为线段
上一点,点
,
关于直线
对称,
于点
,直线
,
交于点
,连结
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cb77ff96-0cbd-4bf0-9058-26adf5817e1f.png?resizew=155)
(1)若
,求用含
的代数式表示
的长;
(2)在(1)的条件下时,若
,求
的长;
(3)连接
,若
,
与
的面积之比为1:2,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2d70e3b6a86cadfc7e5d66253c8a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bbd4869dbffe2c1d53ab6b2494de547.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cb77ff96-0cbd-4bf0-9058-26adf5817e1f.png?resizew=155)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)在(1)的条件下时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6698d3452602370e219ec33b4882441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次