如图,
分别是
的高和角平分线,
.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0032f850bd19a3af6c44c416b0a2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f728adfcae2ef678e379a719f75466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://img.xkw.com/dksih/QBM/2023/1/17/3154631320412160/3154761815703552/STEM/ea4ffd512aaf4cb1a52834dc7a96f36a.png?resizew=173)
22-23七年级下·江苏·单元测试 查看更多[3]
(已下线)7.7 第7章 平面图形的认识(二)综合练习(提优)-【帮课堂】2022-2023学年七年级数学下册同步精品讲义(苏科版)(已下线)专题4.1认识三角形-【帮课堂】2022-2023学年七年级数学下册同步精品讲义(北师大版)宁夏回族自治区银川市兴庆区第十五中学2022-2023学年七年级下学期期中数学试题
更新时间:2023-01-17 14:42:15
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解答题-证明题
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【推荐1】如图
为直线
上一点,
,
平分
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/82ec8f09-5e53-42ba-ae98-764d809f6300.png?resizew=236)
(1)
的余角有________(填图中已有的角);
(2)求
的度数;
(3)试判断
是否平分
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618ede24ca37aa33a3789867be8f66b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/82ec8f09-5e53-42ba-ae98-764d809f6300.png?resizew=236)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(3)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
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【推荐2】如图,已知∠AOC:∠BOC=1:4,OD平分∠AOB,且∠COD=36°,求∠AOB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/95a84b70-0c91-44f7-ae82-985e0e204f99.png?resizew=168)
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解答题-证明题
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较易
(0.85)
【推荐1】如图,
中,
,其外角
和内角
的平分线
与
交于点
.
(1)求证:
.
(2)连
,若
,求
的度数.
![](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/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42b59b76eafbbe36f13b2daa60132c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/f80e0530-594e-4bc5-99ab-a8c41876b779.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
(2)连
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4923f19a1d6f7bf16debca5670f628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
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【推荐2】如图,点
,
分别在等边
的边
,
上,
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/c1b1f240-10a4-4e6d-97f9-213a8fa7ebfa.png?resizew=149)
(1)求证:
.
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/c1b1f240-10a4-4e6d-97f9-213a8fa7ebfa.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327d1c2faee1d33db246ab52e43e4f9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080bffe5d8683cc24d993d0939a9fc74.png)
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