如图,直线
、
相交于点
,射线
在
内,
.
(1)若
平分
,求
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820f4c2acb76f4d24967b09329bff425.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a07c4b26946175b1c826a208fa6d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718803806363648/2791714323210240/STEM/d7cddac2-f6a0-4c2c-a354-3cd47657f60a.png)
更新时间:2021-08-22 16:20:14
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相似题推荐
解答题-作图题
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【推荐1】阅读材料并回答问题:数学课上,老师给出了如下问题:已知,如图1,
,
平分
.若
,请你补全图形,并求
的度数.
解:如图2,作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
因为
,
平分
,
所以
______________,
因为
,
所以
_____________
______________,
同学二说:“符合题目要求的图形还有一种情况.”
请你完成以下问题:
(1)将同学一的解答过程空缺部分补充完整;
(2)判断同学二的说法是否正确,若不正确,请说明理由;若正确,请你在图中画出另一种情况对应的图形,并求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c481ef85b55bb2fce640343c46979f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
解:如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fc14a92f2241b6b12028bc295bd6fe.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c481ef85b55bb2fce640343c46979f.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2785485bc82b8c4412ccb6fe9b1e63ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
同学二说:“符合题目要求的图形还有一种情况.”
请你完成以下问题:
(1)将同学一的解答过程空缺部分补充完整;
(2)判断同学二的说法是否正确,若不正确,请说明理由;若正确,请你在图中画出另一种情况对应的图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
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【推荐2】如图1,
,
都是直角.
(1)试猜想
与
的数量关系,并说明你的理由.
(2)当
绕着点O旋转到图2的位置时,你原来的猜想还成立吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/32c50f02-da66-4b32-8839-dfd22bd038cc.png?resizew=298)
(1)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1e2a60c37ebc303d4fc2bf3d6a234.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
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解答题-证明题
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【推荐1】如图,点D,E,F分别是三角形
的边
,
,
上的点,
,
.
;
(2)若
平分
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499c1138294ecfbb0fd556802e08f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13d29f06d859b6c4979464852ccd07d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424269ceef173843aae76e39ecdf6111.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d6286a4689ba0c3b3bdd9358855266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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【推荐2】如图,
,
.
,求
的度数.
(2)若
平分
,求证:
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed619e2dc900c52a29012e5b821451bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b4eb3df08757e2b6c15122a6ca89f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384da7acfefa7c656eaca2df173f0cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
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【推荐1】如图,
平分
,
在
上,
在
上,
与
相交于点
,
,试说明
.(请通过填空完善下列推理过程)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992804985675776/3078046970216448/STEM/fdb2bcc3047640c0ac906183e2faf6b3.png?resizew=183)
解:因为
(已知)
(____).
所以
______
.
所以FG
BD(____).
所以
______(____).
因为
平分
.
所以
______(____).
所以______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926e1a6fd573c2cce3aae4d0a83302c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992804985675776/3078046970216448/STEM/fdb2bcc3047640c0ac906183e2faf6b3.png?resizew=183)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926e1a6fd573c2cce3aae4d0a83302c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f9b7ce68b8373659e96efb8cfaadff.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcabdf5f40e9f95d6398714d6028e2bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
所以FG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d715af2d0f55f1f8855361afee3fd0f.png)
所以______.
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【推荐2】如图,两直线
相交于点
,
平分
,如果
.
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513587714031616/2514253161766912/STEM/3030c5f905174e029d10487845b873ee.png?resizew=174)
(1)求
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c3bd2ba80606021f11923df8fe2766.png)
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513587714031616/2514253161766912/STEM/3030c5f905174e029d10487845b873ee.png?resizew=174)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
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【推荐2】如图,直线
与
相交于点
,
平分
,且
,射线
在
内部.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/6a9c8cc3-d444-4ed7-9454-681423a3460e.png?resizew=98)
(1)求
的度数;
(2)若
,求
的度数.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb98182f42250d9fdd2159cdc3204634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16b4afac4bba7bd08f7977be364765d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1ef20e4c98b46d04644f1b1f5e65f1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/6a9c8cc3-d444-4ed7-9454-681423a3460e.png?resizew=98)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cb611abd3d538ddede5929022161c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9490679349a3c15ad464ea3be241a760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3e17ed7597f141bb64b74c22ba112a.png)
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