如图,已知
中,
,
是边
上一点,且
,过点
作
,并截取
,射线
与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/c102b51e-7b56-4d5b-b967-8372d888390c.jpg?resizew=100)
(1)求证:
;
(2)设
,
,求
与
的函数关系式;
(3)如果
是直角三角形,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a1d4c140243ba9a9bd7256ec2bbce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a3a922f7ea64083c415c72259179a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/c102b51e-7b56-4d5b-b967-8372d888390c.jpg?resizew=100)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e141fac5c7a9094b62a96c2505a63e5.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39f428621c72cd807963ffaae5c6d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
更新时间:2024-01-16 16:06:45
|
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【推荐1】如图,在四边形ABCD中,∠A=∠BCD=90°,BC=DC,延长AD到E,使DE=AB.
(1)求证:∠ABC=∠EDC;
(2)求证:△ABC≌△EDC.
(1)求证:∠ABC=∠EDC;
(2)求证:△ABC≌△EDC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/6f987fac-dee5-41c2-b21c-02486fe6ebf2.png?resizew=171)
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【推荐2】如图,
中,
、
分别为边
、
中点,连接
并延长至点
,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027356237824/2493218169978880/STEM/5dae15512c894ef0ad44088e34c778c9.png?resizew=161)
(1)求证:
;
(2)若
,
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的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab44376f8af7ae334cbe95d064015383.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed3a08add0f389dbe3f7f74575faf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92d220be10b55272aab5bacd9f69721.png)
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【推荐1】如图,点C、D在线段AB上,且△PCD是等边三角形.∠APB=120°.
(1)求证:△ACP∽△PDB;
(2)证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/e91a32ab-6ac7-472f-a51d-e207053a7e04.png?resizew=247)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce5eb3d7b6aea8329997ebd45dc851.png)
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【推荐2】如图1,在菱形ABCD中,AC=2,BD=
,AC,BD相交于点O.
(1)求边AB的长;
(2)如图2,将一个足够大的直角三角板60°角的顶点放在菱形ABCD的顶点A处,绕点A左右旋转,其中三角板60°角的两边分别与边BC,CD相交于点E,F,连接EF与AC相交于点G.
①判断△AEF是哪一种特殊三角形,并说明理由;
②旋转过程中,当点E为边BC的四等分点时(BE>CE),求CG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)求边AB的长;
(2)如图2,将一个足够大的直角三角板60°角的顶点放在菱形ABCD的顶点A处,绕点A左右旋转,其中三角板60°角的两边分别与边BC,CD相交于点E,F,连接EF与AC相交于点G.
①判断△AEF是哪一种特殊三角形,并说明理由;
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【推荐1】如图,矩形ABCD中,已知AB=6.BC=8,点E是射线BC上的一个动点,连接AE并延长,交射线DC于点F.将△ABE沿直线AE翻折,点B的对应点为点B'.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975841816510464/2977079169581056/STEM/a0da3da6a51342f49d63ed6108b261d9.png?resizew=323)
(1)如图1,若点E为线段BC上一点,延长AB'交CD于点M,求证:AM=FM;
(2)如图2,若点B'恰好落在对角线AC上,求
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(3)若
,求∠DAB'的正弦值.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975841816510464/2977079169581056/STEM/a0da3da6a51342f49d63ed6108b261d9.png?resizew=323)
(1)如图1,若点E为线段BC上一点,延长AB'交CD于点M,求证:AM=FM;
(2)如图2,若点B'恰好落在对角线AC上,求
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(3)若
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(1)试判断CD与⊙O的位置关系,并证明你的结论;
(2)若⊙O的半径为3,sin∠ADE=
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【推荐1】(1)地表以下的岩层的温度和它所处的深度有以下关系:
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301737816031232/2303460395655168/STEM/c2f59b12d2594c9a9c4c1b4edab36805.png?resizew=478)
①上表反映了两个变量之间的关系,哪个是自变量?哪个是因变量?
②深度每增加
,温度增加多少摄氏度?
③估计
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(2)已知:如图,
于
,
于G,
.
求证:
平分
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301737816031232/2303460395655168/STEM/c2f59b12d2594c9a9c4c1b4edab36805.png?resizew=478)
①上表反映了两个变量之间的关系,哪个是自变量?哪个是因变量?
②深度每增加
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890f0b4e81634bb7e013412698640f3.png)
③估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3fb33e7fb8709bd8d5db686644d50b.png)
(2)已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fecb0de8722100cf0735bcaab2854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a7a5217c986582199fa2720932c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f3bd65a3cb559b8003199908990f59.png)
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【推荐2】行驶中的汽车,在刹车后由于惯性的作用,还要继续向前滑行一段距离才能停止,这段距离称为“刹车距离”.为了测定某种型号汽车的刹车性能(车速不超过
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(1)当刹车时车速为
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(2)该种型号汽车的刹车距离用
表示,刹车时车速用
表示,根据上表反映的规律写出y与x之间的关系式.
(3)你能否估计一下,该种车型的汽车在车速为
的行驶过程中,前面有一汽车遇紧急情况急刹并停在距该车
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刹车时车速(![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
刹车距离![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7822b217ea4ee15ff83d5ba429f8f6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022abc6afd4deff13845419fa38312e.png)
(2)该种型号汽车的刹车距离用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f38197c34c42e180eac825662efd62d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62223a18b6898131efb36c7d1f2b218.png)
(3)你能否估计一下,该种车型的汽车在车速为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e0e99cb231d2b5d91e8d7055cf6e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146ea9ed5176797da555a70bbe9602c4.png)
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