如图1,在矩形
中,
.动点
从
出发以
的速度向
运动,动点
从
出发以
沿折线
运动,当点
运动到
时,点
立即停止运动,运动时间记为
.把线段
绕点
逆时针旋转
得线段
,连接
,
,运动过程中四边形
的面积记为
,且
,
的面积记为
.
与
的函数关系式以及对应自变量
的取值范围.
(2)在给定的平面直角坐标系中,画出
的函数图象,并写出函数
图象的一条性质:________.
(3)结合图象,当
时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262c7476d86456505d7c32413723adb7.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/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c421682f548aa944df7b124b4d732a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74c45f334b0d49cc203526f7f6e43e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0c289f271a0b39f71d588ea9cea6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217d37ca5469a57cb7417a2ac0d58efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9724cf149ccc974596673c8aaae9558f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)在给定的平面直角坐标系中,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9724cf149ccc974596673c8aaae9558f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)结合图象,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421a7d6f54bf58a7a4f4ce61e06aefa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
2023·重庆沙坪坝·模拟预测 查看更多[2]
2023-2024学年重庆第八中学九年级上学期12月数学模拟预测题(已下线)中考重点05 动态几何+函数图像(6题型+满分技巧+限时检测)-2024年中考数学【热点·重点·难点】专练(重庆专用)
更新时间:2024-03-22 12:36:18
|
相似题推荐
解答题-作图题
|
适中
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【推荐1】如图,P是线段AB上的一点,AB=6cm,O是AB外一定点.连接OP,将OP绕点O顺时针旋转120°得OQ,连接PQ,AQ.小明根据学习函数的经验,对线段AP,PQ,AQ的长度之间的关系进行了探究.
下面是小明的探究过程,请补充完整:
(1)对于点P在AB上的不同位置,画图、测量,得到了线段AP,PQ,AQ的长度(单位:cm)的几组值,如表:
在AP,PQ,AQ的长度这三个量中,确定 的长度是自变量, 的长度和 的长度都是这个自变量的函数;
(2)在同一平面直角坐标系xOy中,画出(1)中所确定的函数的图象;
(3)结合函数图象,解决问题:当AQ=PQ时,线段AP的长度约为 cm.
下面是小明的探究过程,请补充完整:
(1)对于点P在AB上的不同位置,画图、测量,得到了线段AP,PQ,AQ的长度(单位:cm)的几组值,如表:
位置1 | 位置2 | 位置3 | 位置4 | 位置5 | 位置6 | 位置7 | |
AP | 0.00 | 1.00 | 2.00 | 3.00 | 4.00 | 5.00 | 6.00 |
PQ | 4.00 | 2.31 | 0.84 | 1.43 | 3.07 | 4.77 | 6.49 |
AQ | 4.00 | 3.08 | 2.23 | 1.57 | 1.40 | 1.85 | 2.63 |
(2)在同一平面直角坐标系xOy中,画出(1)中所确定的函数的图象;
(3)结合函数图象,解决问题:当AQ=PQ时,线段AP的长度约为 cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/a55a317a-7c56-4975-8ccb-4de10f36ca0b.png?resizew=370)
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【推荐2】如图,P是线段AB上的一点,
,O是AB外一定点,连接OP,将OP绕点O顺时针旋转
得OQ,连接PQ,AQ.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/9317e72b-b436-47de-8c19-5101c97a888f.png?resizew=262)
小腾根据学习函数的经验,对线段AP,PQ,AQ的长度之间的关系进行了探究.
下面是小腾的探究过程,请补充完整:
(1)对于点P在AB上的不同位置,画图、测量,得到了线段AP,PQ,AQ的长度(单位:cm)的几组值,如下表:
小腾发现:在AP,PQ,AQ的长度这三个量中,若AP的长度是自变量,则PQ的长度和AQ的长度都是自变量AP的函数,请判断小腾的发现是否正确.___(填“正确”或“不正确”).
(2)若小腾的发现是正确的,请在同一平面直角坐标系xOy中,画出(1)中所确定的函数的图象;若小腾的发现是错误的,请重新确定自变量和函数,并在同一平面直角坐标系
中,画出你所确定的函数的图象.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/e0762767-0706-478c-b493-ad5b2f7cb771.png?resizew=291)
(3)结合函数图象,解决问题:若点P与点A不重合,且当
时,线段AP的长度约为_______cm.(精确到0.1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/9317e72b-b436-47de-8c19-5101c97a888f.png?resizew=262)
小腾根据学习函数的经验,对线段AP,PQ,AQ的长度之间的关系进行了探究.
下面是小腾的探究过程,请补充完整:
(1)对于点P在AB上的不同位置,画图、测量,得到了线段AP,PQ,AQ的长度(单位:cm)的几组值,如下表:
位置1 | 位置2 | 位置3 | 位置4 | 位置5 | 位置6 | 位置7 | |
AP | 0.00 | 1.00 | 2.00 | 3.00 | 4.00 | 5.00 | 6.00 |
PQ | 4.00 | 2.31 | 0.84 | 1.43 | 3.07 | 4.77 | 6.49 |
AQ | 4.00 | 3.08 | 2.23 | 1.57 | 1.40 | 1.85 | 2.63 |
(2)若小腾的发现是正确的,请在同一平面直角坐标系xOy中,画出(1)中所确定的函数的图象;若小腾的发现是错误的,请重新确定自变量和函数,并在同一平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/e0762767-0706-478c-b493-ad5b2f7cb771.png?resizew=291)
(3)结合函数图象,解决问题:若点P与点A不重合,且当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ecd96adaec63c5bbd65f59f885ecfd.png)
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【推荐1】如图,过点A(0,3)的一次函数y1=kx+b(k≠0)的图象与正比例函数y2=2x的图象相交于点B,且点B的横坐标是1.
![](https://img.xkw.com/dksih/QBM/2019/7/31/2258650977533952/2260739516006400/STEM/d40756c8dbc74b67aa975ed851d0d730.png?resizew=163)
(1)求点B的坐标及k、b的值;
(2)若该一次函数的图象与x轴交于D点,求△BOD的面积
(3)当y1≤y2时,自变量x的取值范围为 .
![](https://img.xkw.com/dksih/QBM/2019/7/31/2258650977533952/2260739516006400/STEM/d40756c8dbc74b67aa975ed851d0d730.png?resizew=163)
(1)求点B的坐标及k、b的值;
(2)若该一次函数的图象与x轴交于D点,求△BOD的面积
(3)当y1≤y2时,自变量x的取值范围为 .
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解答题-问答题
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【推荐2】如图,已知一次函数
的图像与
轴交于点
,一次函数
的图像与
轴交于点
,且与
轴以及一次函数
的图像分别交于点
、
,点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386260051542016/2386899054845952/STEM/f6f3e808a7b44a25b190ea5d968a83d8.png?resizew=186)
(1)关于
、
的方程组
的解为______________.
(2)关于
的不等式
的解集为__________________.
(3)求四边形
的面积;
(4)在
轴上是否存在点
,使得以点
,
,
为顶点的三角形是直角三角形?若存在,求出点
的坐标:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc01f9c0bb942073f43a353e14d04845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c426aab9c6749ecbec727c528c036f0.png)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386260051542016/2386899054845952/STEM/f6f3e808a7b44a25b190ea5d968a83d8.png?resizew=186)
(1)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16430770953ef864bb983db0628126d2.png)
(2)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4eb938414d9399707cb6c3cc169ed10.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d439e428bc3bf8778c274dd683f4fde9.png)
(4)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解答题-问答题
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【推荐1】如图,在平面直角坐标系
中,一次函数
的图象过点A(4,1)与正比例函数
(
)的图象相交于点B(
,3),与
轴相交于点C.
![](https://img.xkw.com/dksih/QBM/2019/12/2/2346549584748544/2346679295041536/STEM/4200ee4d07c749ffbc15023e1de7604f.png?resizew=226)
(1)求一次函数和正比例函数的表达式;
(2)若点D是点C关于
轴的对称点,且过点D的直线DE∥AC交BO于E,求点E的坐标;
(3)在坐标轴上是否存在一点
,使
.若存在请求出点
的坐标,若不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bd144e0e96e4236a14523e0729cacb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2019/12/2/2346549584748544/2346679295041536/STEM/4200ee4d07c749ffbc15023e1de7604f.png?resizew=226)
(1)求一次函数和正比例函数的表达式;
(2)若点D是点C关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在坐标轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863b8f8b9cd55a44472fdf19724a134b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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【推荐2】如图,
在直角坐标系中,
,点
,
的正切值为
,直线
与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119400968519680/3125829876490240/STEM/fc39399bc4ec4506b0ad97af80732bbc.png?resizew=246)
(1)求点B的坐标;
(2)将
绕点O顺时针旋转,使点B落在x轴正半轴上的
处,并写出点
的坐标;
(3)在直线
上是否存在点D,使
与
相似?若存在,求出点D的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a80d4477c5fa6dc0a2f61003cf060a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fdfa5407cfa15978f3557cacdf27c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e766af4e5a8e2da765668e91ce645cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a037c23a11c7783b1b44988c21634f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119400968519680/3125829876490240/STEM/fc39399bc4ec4506b0ad97af80732bbc.png?resizew=246)
(1)求点B的坐标;
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fce10478485ef01d2318fc3465bb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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解答题-作图题
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【推荐1】【阅读理解】课外兴趣小组活动时,老师提出了如下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b46d864e-7058-4b77-aa73-439941c6811c.png?resizew=213)
如图1,
中,若
,
,求
边上的中线
的取值范围. 小明在组内经过合作交流,得到了如下的解决方法:延长
到点
,使
,请根据小明的方法思考:
(1)由已知和作图能得到
的理由请选择_________
A.
B.
C.
D. ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
(2)AD的取值范围是_________.
(3)【感悟】解题时,条件中若出现“中点”“中线”字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
【问题解决】如图2,
是
的中线,
交
于点
,交
于点
,且
,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b46d864e-7058-4b77-aa73-439941c6811c.png?resizew=213)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
(1)由已知和作图能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab24c24cef4dd5162753308a6631cb01.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef21f6c326b310efdc1bc2f377b2fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9730d8c39620a403e38171c723d3dfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4194089bef4e0d583fc1e69f0e235ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
(2)AD的取值范围是_________.
(3)【感悟】解题时,条件中若出现“中点”“中线”字样,可以考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
【问题解决】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,高
、
相交于点H,连接
并延长到G,使
,
与
相交于F,连接
,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73032c21673ec4f9d52452da366e7828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566e7140c9420c0047aba3bc2197c03f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9962b2820c2b040c05f3be28525ce4f8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/15/2700480222560256/2700583382237184/STEM/51d619b780634fc09d38d167be32bff4.png?resizew=194)
您最近一年使用:0次