如图,在四边形
中,点
为对角线
上一点,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/0bac72ef-c52a-40bd-ae65-2fac85053f21.png?resizew=183)
(1)证明:①
;
②
;
(2)若
,
,请求出
的长度;
(3)若
,请求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c128e92a54d85972410889a236c9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14af340873c7c4215e8652b3473a83d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/0bac72ef-c52a-40bd-ae65-2fac85053f21.png?resizew=183)
(1)证明:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac9e8a11cace3899df96c2971a399c3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae67423ccd6f90a7e7d10d63815a8e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
更新时间:2023-10-30 11:03:24
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知AB∥CD,∠B=40°,∠D=40°,求证:BC∥DE.
![](https://img.xkw.com/dksih/QBM/2018/4/20/1928262667878400/1929315762462720/STEM/23dcad41-376b-416c-9956-1b681558b3a7.png?resizew=113)
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【推荐2】完成下面证明:如图,
平分
,
.求证
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/499c0adf-64b3-4af3-8321-c4ea19190009.png?resizew=111)
证明:∵
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
∴
( )
∵
( )
∴
( ).
∴
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/499c0adf-64b3-4af3-8321-c4ea19190009.png?resizew=111)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1503237215798ab4694f90a3a5390787.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
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【推荐3】阅读下列材料,并完成相应任务.
如图1,物理学中把经过入射点
并垂直于反射面的直线
叫做法线,入射光线与法线的夹角
叫做入射角,反射光线与法线的夹角
叫做反射角.在反射现象中,反射角等于入射角.因为法线
垂直于反射面,且反射角
入射角
,所以
依据
.利用这个规律,人们制造了潜望镜,图
是潜望镜的工作原理示意图,
,
是平面镜,
是射入潜望镜的光线,
是经平面镜两次反射后离开潜望镜的光线,在反射现象中,蕴含了丰富的数学道理.
任务:
(1)上述材料中的“依据”指的是______;如图2,若入射光线
与反射光线
平行,则
与
的位置关系是______.
(2)改变两面平面镜
,
之间的位置关系,经过两次反射后,入射光线
与反射光线
之间的位置关系会随之改变.如图
,将平面镜
与
在
处相接,一束光线
射到平面镜
上,被
反射到平面镜
上,又被
反射.若被
反射出的光线
和光线
平行,且
,求
的度数.
如图1,物理学中把经过入射点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3db673c03e01726ecdad3e70ef9af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564a405364df92279cbf2dec5cb1beb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/67594989-9e65-47f8-a88b-c741b4eab226.png?resizew=502)
任务:
(1)上述材料中的“依据”指的是______;如图2,若入射光线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(2)改变两面平面镜
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efce314a8e8e67e0f0cc34c487b9bce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ae03026c7796241eebe8b4747c1f86.png)
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名校
【推荐1】如图,在
中,
是高,
是角平分线,
,
.求
和
的度数.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030708f7e622f3f992649b21eec6b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/9cd4a3c0-71cf-45ae-954b-ab9b64b01192.png?resizew=179)
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名校
【推荐2】如图①,在
中,
,O是
的中点,P、Q分别是
上一点,连接
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/1921a790-7d22-44f4-b990-036e1533444b.png?resizew=435)
(1)过B作
交
延长线于点D.
①求证:O为
中点 ;
②求证:
;
(2)如图②,若P、Q分别在
的延长线上,其余条件不变,(1)②中的结论是否成立?若成立,请写出理由;若不成立,请写出正确的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ecfd1251d7c90db45abe109acaf02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7df99fe6438442a9453fc0c57fb703.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/1921a790-7d22-44f4-b990-036e1533444b.png?resizew=435)
(1)过B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c631670e02d2a38e9c78708a3916140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815d1ce1ba84bac399c8b20e074cf045.png)
①求证:O为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2f56f2484b85eced13938a870379eb.png)
(2)如图②,若P、Q分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9c257b0fccbdfb8dad2487ff2ec842.png)
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【推荐1】(1)如图1射线
在
,点B、D在
的边
、
上,且
,
于点C,
于点E,当
______
时,
;
(2)在(1)的条件下,证明
;
(3)探索:如图2,点B,D在
的边
、
上,点E,C在
内部的射线
上,
,
分别是
,
的外角,已知
,
,直接写出
、
与
的关系______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736eca86008d535f03500d32ac00cd46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6b5026f0d684bf35cc3237bcd3ae2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26505d35570a350de35fa723887aa5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d4b59e42a838353cdddd7921c4d188.png)
(2)在(1)的条件下,证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d4b59e42a838353cdddd7921c4d188.png)
(3)探索:如图2,点B,D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977f50d4ca53ddd02415ae7cf32a1d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/9dc53dac-d8ab-4c3a-98fc-f292e4ba9c64.png?resizew=336)
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解答题-证明题
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,∠ABC=30°,D是直角边BC所在直线上的一个动点,连接AD,将AD绕点A逆时针旋转60°到AE,连接BE,DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/9ab37061-8e97-4d39-baa4-830425cd81ec.png?resizew=517)
(1)如图1,当点E拾好在线段BC上时,请判断线段DE和BE之间的数量关系,并说明理由;
(2)如图2,当点E不在直线BC上时,其他条件不变,(1)中结论是否成立?若成立,请给予证明:若不成立,请求出DE和BE之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/9ab37061-8e97-4d39-baa4-830425cd81ec.png?resizew=517)
(1)如图1,当点E拾好在线段BC上时,请判断线段DE和BE之间的数量关系,并说明理由;
(2)如图2,当点E不在直线BC上时,其他条件不变,(1)中结论是否成立?若成立,请给予证明:若不成立,请求出DE和BE之间的数量关系.
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解答题-证明题
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适中
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【推荐1】如图,在
中,
,点D,E都在边
上,且
,那么
与
相等吗?请证明你的结论.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/38923d47-596a-4d15-90cc-17f0d93f12ec.png?resizew=223)
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解答题-证明题
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适中
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【推荐2】如图,已知在
中,
,点D在边
上,连接
,以
为斜边作等腰直角三角形
(点E在直线
右侧),连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/db80e89c-f721-44b7-810c-3b8ad802d825.png?resizew=200)
(1)如果
,求证:
;
(2)如果
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/db80e89c-f721-44b7-810c-3b8ad802d825.png?resizew=200)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/952e4cdbbd5e65a35f65139a2ea8e0d6.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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