(1)如图,直线AB、CD相交于点O,OF平分∠AOD,OE⊥OF,∠COB=110°,OE是∠AOC的角平分线吗?说明理由?求∠EOC的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/47c4cefc-8d66-4e71-a309-9bd55ab46cdb.png?resizew=127)
(2)如图,延长线段AB到C,使BC=4AB,M,N是线段BC上两点,且BM:MN=2:3,N点是MC的中点,AC=50.求线段MN的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/47c4cefc-8d66-4e71-a309-9bd55ab46cdb.png?resizew=127)
(2)如图,延长线段AB到C,使BC=4AB,M,N是线段BC上两点,且BM:MN=2:3,N点是MC的中点,AC=50.求线段MN的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/6979ff9b-b37a-481b-a63b-9fb5b3548e1f.png?resizew=178)
更新时间:2022-02-19 15:11:32
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,点
为线段
上一点,线段
与
的长度之比为
.若点
为线段
的中点,点
为线段
中点.
(1)当线段
时,求线段
的长.
(2)当线段
时,求线段
的长(用
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1dcdac71e394e495d069f64e1f1ce9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/f61e14f1-bdaa-42a8-be75-1222bf10491d.png?resizew=340)
(1)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88250576ff7428d193b725e86401b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】如图,点C是线段
的中点,点D在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689574415499264/2689714049286144/STEM/79186ff8-d313-49e1-a4ba-af371853058c.png)
(1)若
,求线段
的长.
(2)若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)若
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(2)若
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解答题-计算题
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适中
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【推荐1】已知O是直线
上的一点,
是直角.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/97cfc643-99c4-477a-bfb1-9f8f81446a36.png?resizew=566)
(1)若
平分
,当
时,如图1,求
的度数;
(2)如图2,
平分
,
平分
,求
的度数;
(3)如图3,若
,此时
的边
与
重合,当
绕点O逆时针方向旋转
,旋转过程中
始终平分
,请直接写出
与
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/97cfc643-99c4-477a-bfb1-9f8f81446a36.png?resizew=566)
(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcc6ea3a5df3a1c0104f36b3c51455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a52e349973e2c589b48066c9068a8e.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
(3)如图3,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e2659428a1746e78fbeb7da2eeeddb.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
平分
,且与线段
相交于点
,
是
上一点,连接
.若
,
.
与
平行吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b1848fa4f378761a9d734e9d0aa9de.png)
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【推荐1】
中,
,点
,
分别是边
,
上的点,点
是一动点,令
,
,
.
(1)若点
在线段
上,如图
所示,且
,则
______
;
(2)若点
在边
上运动,如图
所示,则
、
、
之间的关系为______ ;
(3)如图
,若点
在斜边
的延长线上运动
,请写出
、
、
之间的关系式,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/48badee1-1863-461e-9b05-dfa6ec475c32.jpg?resizew=427)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0664699cab2130e2b8fb5d976848418b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa61f1be96d581867ea9f074420a2252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef88b78ea0ec4e53e38dca0dde809f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,直线
相交于点
,
平分
.
,求
的度数;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9ec9a0b3a5aba39f61ac1ec5084a61.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5767d5e7d7cc835483dc954aa122f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,直线AB与CD相交于点O,OE⊥CD.
(1)若∠BOD=28°,求∠AOE的度数.
(2)若OF平分∠AOC,小明经探究发现:当∠BOD为锐角时,∠EOF的度数始终都是∠BOC度数的一半,请你判断他的发现是否正确,并说明理由.
(1)若∠BOD=28°,求∠AOE的度数.
(2)若OF平分∠AOC,小明经探究发现:当∠BOD为锐角时,∠EOF的度数始终都是∠BOC度数的一半,请你判断他的发现是否正确,并说明理由.
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解答题-证明题
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适中
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名校
【推荐2】如图,在
中,
,E为边AC上一点(不与点A,C重合),连接BE,在BE的延长线上取点D,连接DC.
的邻补角的角平分线和
的邻补角的角平分线交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/c98e1f42-fbbf-4d63-8396-f90126685a17.png?resizew=214)
(1)当
时,求证:
①
;
②
;
(2)判断
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/c98e1f42-fbbf-4d63-8396-f90126685a17.png?resizew=214)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6986ba91e88e6b72efde829a15003b49.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bba8e0d0a84be821e404c93852543ca.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
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