在
中,
,
是
的高线,
是
的角平分线
,
,试求
的度数;
(2)如图2,若点
是
延长线上一点,
于G,试求
与
、
之间的数量关系:
(3)如图3,延长
到点M,
的平分线和
的延长线交于点N,试说明
和
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76ffd241623ec4ee9fd08876464def3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(3)如图3,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
更新时间:2024-04-21 21:47:57
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
点
分别为
上的点,连接
.若
,式判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f4728c145cd33d5e95fe205243e5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7490886e2807c7b8a4fa57d99c4dc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438680488452096/2439150837645312/STEM/3e6244f6eed14b6e9b914752e4640396.png?resizew=186)
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【推荐2】如图,四边形
中,
,
平分
平分
,
,
交于点E.
的度数.
(2)若
于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde6d65465d6b6453f663383f7738c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3da4320e1d1bc25f4e210f03486a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7316430d26a6f4bcc0bdadfd1a5330a.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,网格中的每个小正方形的边长都是2,线段交点称做格点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/e4c59e45-6051-451d-872e-5eca70756fa4.png?resizew=201)
(1)画出
的高
;
(2)连接格点,用一条线段将图中
分成面积相等的两部分;
(3)直接写出
的面积是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/e4c59e45-6051-451d-872e-5eca70756fa4.png?resizew=201)
(1)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)连接格点,用一条线段将图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】作图题
(1)①画出
关于
轴对称的图形
,② 求出
的面积;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/cc1d82c6-8d1d-42d4-9016-1263f103179e.png?resizew=235)
(2)我们知道, 矩形的面积等于这个矩形的长乘宽,小明想用其验证一个底为
,高为
的三角形的面积公式为
.想法是:以
为边作矩形
,点A在边
上,再过点A作
的垂线,将其转化为证三角形全等,由全等图形面积相等来得到验证.按以上思路完成下面的作图与填空:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/759a77fe-f28e-445a-95cb-621ad3fcf4d8.png?resizew=140)
证明:用直尺和圆规过点A作
的垂线
交
于点D.(只保留作图痕迹)
在
和
中,
∵
,
∴
,
∵
,
∴ ,
∵
,
∴ ,
又∵ ,
∴
,
同理可
,
.
(1)①画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/cc1d82c6-8d1d-42d4-9016-1263f103179e.png?resizew=235)
(2)我们知道, 矩形的面积等于这个矩形的长乘宽,小明想用其验证一个底为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f43107437a69b2a0e081e6df786268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/759a77fe-f28e-445a-95cb-621ad3fcf4d8.png?resizew=140)
证明:用直尺和圆规过点A作
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a704d66dfbe9ce7397633b8abdfc578f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac4b6e138df1ff677092e8aad75eb38.png)
∴ ,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbff70350b027ad98dd2038111e4c92e.png)
∴ ,
又∵ ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/984ec1648666ccf2bf1b4d9ed2cff122.png)
同理可
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2202392ff440b7fa3b36e8835c819d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2cb734f4a562dfa92a5eecf623fd2d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,已知
中,
,点
在边
上,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecaba74c167879c768991a93dd6780a5.png)
求证:(1)
(2)
.
![](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/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecaba74c167879c768991a93dd6780a5.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d5e567edfc01ed572530005ed05385.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729da4cfde9310f8fc2e6647ac12a129.png)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851660641075200/2855201972387840/STEM/909591c6-1f0b-4964-9cb3-4bcf9ef5604f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图1,
,点A,B分别在
的边
,
上(不与点O重合).
是
的平分线,
的反向延长线与
的平分线交于点D.则
的度数为_______.
(2)如图2,若
,
,求
的度数.
(3)如图3,若将“
”改为“
(
)”,
,
,求
的度数(用含
,n的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefb9a7a779b6c8d21187ee751c420a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/944821f4f4bbf40c6a75243c6370fee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd33efbe3dc4217c911769558d1c3d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(3)如图3,若将“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84261efd0ff6fafdc55cd446c1a5f68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8fa5f2f64e1db95bc35a060a85112fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee616a8fc5f5e01aa957e1a016f1bc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-问答题
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适中
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名校
【推荐3】在数学探究课上,同学们发现改变图(1)中圆周角
的顶点
的位置,可以得到类似
和
这样顶点在圆外和圆内的角.结合数学课上学习的圆周角的概念,对顶点在圆外和圆内的角进行定义:顶点在圆外,两边都与圆相交的角叫做圆外角;顶点在圆内的角叫做圆内角.如图(1)
和
分别是
所对的圆外角和圆内角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/d79cdc1a-3eee-4756-bcc6-2dc9576e851e.png?resizew=138)
(1)如图(2),点
,
在
上,
为
所对的一个圆外角.
,
分别交
于点
,
.若
,
所对的圆心角为
,求
的度数.
(2)如图(3),当点P在
内时,
是
所对的一个圆内角,延长
交
于点C,延长
交
于点D,若
,
所对的圆心角为
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7274098e5a3b12ce85ac7286f0732c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9d1faba756694df00a208fac415ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7274098e5a3b12ce85ac7286f0732c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9d1faba756694df00a208fac415ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/dad050c8-e2fa-4ae8-ac25-450f9fb0e971.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/a6b6443c-7d16-4e10-a28b-82b76126b586.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/d79cdc1a-3eee-4756-bcc6-2dc9576e851e.png?resizew=138)
(1)如图(2),点
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.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/3d97cdc586744d208b6f69c9813af977.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/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb94bd9eb80fb9f5f02f518bb8f2211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(2)如图(3),当点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff73892a5566e1eff4955174277e24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
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【推荐1】在△ABC中,AD⊥BC于D,AE平分∠BAC.
(1)若∠ACD=70°,∠ABD=40°,求∠EAD;
(2)∠ACD=α,∠ABD=β,∠AED为 .
(1)若∠ACD=70°,∠ABD=40°,求∠EAD;
(2)∠ACD=α,∠ABD=β,∠AED为 .
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【推荐2】已知,如图,在△ABC中,AD,AE分别是△ABC的高和角平分线,若∠B=35°,∠C=65°.求∠DAE的度数.
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【推荐3】如图1,已知∠MON=80°,A、B两点同时从点O出发,点A以每秒x个单位长度沿射线ON匀速运动,点B以每秒y个单位长度沿射线OM匀速运动.
(1)若运动1s时,点A运动的路程比点B运动路程的2倍还多1个单位长度,运动3s时,点A、点B的运动路程之和为12个单位长度,则x= ,y= .
(2)如图2,点C为△ABO三条内角平分线交点,连接BC、AC,在点A、B的运动过程中,∠ACB的度数是否发生变化?若不发生变化,求其值;若发生变化,请说明理由.
(3)如图3,在(2)的条件下,连接OC并延长,与∠ABM的角平分线交于点P,与AB交于点Q.
①试说明∠PBQ=∠ACQ.
②在△BCP中,如果有一个角是另一个角的2倍,请直接写出∠BAO的度数.
(1)若运动1s时,点A运动的路程比点B运动路程的2倍还多1个单位长度,运动3s时,点A、点B的运动路程之和为12个单位长度,则x= ,y= .
(2)如图2,点C为△ABO三条内角平分线交点,连接BC、AC,在点A、B的运动过程中,∠ACB的度数是否发生变化?若不发生变化,求其值;若发生变化,请说明理由.
(3)如图3,在(2)的条件下,连接OC并延长,与∠ABM的角平分线交于点P,与AB交于点Q.
①试说明∠PBQ=∠ACQ.
②在△BCP中,如果有一个角是另一个角的2倍,请直接写出∠BAO的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/d1ca9bb7-b207-4bf1-bef7-d69efd09424f.png?resizew=473)
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