如图,点
在线段
上,点
,
在线段
上,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/b986e228-9365-48b6-b2f3-deecd02a0e57.png?resizew=186)
(1)求证:
.
(2)若
于点
,
平分
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2120afec47faaeaa6959808d1ec7bfc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/b986e228-9365-48b6-b2f3-deecd02a0e57.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0190613b6a9f28558522114937c788b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
更新时间:2022-08-06 00:34:44
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】交通部门为了安全起见在某道路两旁设置了
,
两座可旋转探照灯.假定主道路是平行的,即
,
,
为
上两点,
平分
交
于点
,
为
上一点,连接
,
平分
交
于点
.
,则
______;
(2)若点
为线段
上一点,且满足
,当
时,试说明:
;
(3)在(1)问的条件下,探照灯
,
射出的光线在道路所在平面旋转.探照灯
射出的光线
从
处开始以每秒
的速度绕点
逆时针转动,探照灯
射出的光线
从
处开始以每秒
的速度绕点
逆时针转动,当
转至射线
后立即以相同速度回转.若它们同时开始转动,当
回到出发时的位置
时同时停止转动.设转动时间为
秒,则在转动过程中,当
时,请直接写出此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3167074c4bbc71cb2e9b5d86c8f7c7.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c4eeabce6b3c49226a8d1ef078c823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459459559720ab5e154a80723c47cc30.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de87b2798366103f340a935868b21bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20490330b6361da09ace27844c43d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43be568ae5186900cfb39484a3c9301.png)
(3)在(1)问的条件下,探照灯
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea61ddc41f927684c6dfaacdd7f8e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb204f42d5fb6cd55050a18cca2804b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0afe43d331037dddf1c86fd36e50cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab234099db50b451eb6ec2d5b21fe1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0afe43d331037dddf1c86fd36e50cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0afe43d331037dddf1c86fd36e50cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25614aca79ccefcb9754c0ce109db03f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在△ABC 中,BE 平分∠ABC,DE∥BC.
(1)判断△DBE 是什么三角形,并说明理由;
(2)若 F 为 BE 中点,∠ABC=58°,试说明 DF⊥BE,并求∠EDF 的度数.
(1)判断△DBE 是什么三角形,并说明理由;
(2)若 F 为 BE 中点,∠ABC=58°,试说明 DF⊥BE,并求∠EDF 的度数.
![](https://img.xkw.com/dksih/QBM/2019/7/29/2257456844316672/2282114169741312/STEM/21bf06d0823c41778cfe8d105926eab1.png?resizew=139)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】(1)如图(a),如果∠B+∠E+∠D=360°,那么AB、CD有怎样的关系?为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/1cd02964-85cc-45d0-97d9-4ce208c75ff0.png?resizew=592)
解:过点E作EF∥AB①,如图(b),
则∠ABE+∠BEF=180°,(______)
因为∠ABE+∠BED+∠EDC=360°(______)
所以∠FED+∠EDC=______°(等式的性质)
所以FE∥CD②(______)
由①、②得AB∥CD(______).
(2)如图(c),当∠1、∠2、∠3满足条件______时,有AB∥CD.
(3)如图(d),当∠B、∠E、∠F、∠D满足条件______时,有AB∥CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/1cd02964-85cc-45d0-97d9-4ce208c75ff0.png?resizew=592)
解:过点E作EF∥AB①,如图(b),
则∠ABE+∠BEF=180°,(______)
因为∠ABE+∠BED+∠EDC=360°(______)
所以∠FED+∠EDC=______°(等式的性质)
所以FE∥CD②(______)
由①、②得AB∥CD(______).
(2)如图(c),当∠1、∠2、∠3满足条件______时,有AB∥CD.
(3)如图(d),当∠B、∠E、∠F、∠D满足条件______时,有AB∥CD.
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,点D为△ABC角平分线BE延长线上的一点,AB=AD,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/cdf1776b-0e9a-4c91-9a5c-501d0c650984.png?resizew=305)
(1)求证:
;
(2)若∠D=30°,
①如图1,当∠C=70°,则∠DEC=______;
②如图2,若AF平分∠DAC,且∠AFB=70°,则∠BAC=______;
(3)在(2)②的条件下,若P也在∠DAC的平分线上,连接PB,当
时,请直接写出∠APB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/cdf1776b-0e9a-4c91-9a5c-501d0c650984.png?resizew=305)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
(2)若∠D=30°,
①如图1,当∠C=70°,则∠DEC=______;
②如图2,若AF平分∠DAC,且∠AFB=70°,则∠BAC=______;
(3)在(2)②的条件下,若P也在∠DAC的平分线上,连接PB,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988c15a634725a3c9fd9ea5a37dd5865.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在
中,点D在边BC上,点G在边AB上,点E、F在边AC上,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004e6655e437d56876deb4146c0190f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af13586681abc06d8b41fab349294ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】
如图
,
,
,
,求
的长;
如图
,在
中,
是
边上的高,点
是
上一点,
交
于点
,且
,求证:
是直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcde2082838590b9968422587fe94fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,锐角
的两条高
与
相交于点
,且
.
(1)试说明
;
(2)连接
并延长,交
于
,若
,求
和
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77c8ef75793d21d2d5d8bf470a61159.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7639c9377144ace567c2d0808647aa77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754442422206464/2788933710733312/STEM/a0b1ffa5-0b39-42d6-ae6b-49fa7eaf349d.png?resizew=200)
您最近一年使用:0次