如图,点
是
的中点,
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/987a4f1b-2994-459a-a6d8-254e81fea5e8.jpg?resizew=127)
(1)求证
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab59dc27778ac84c3f857e9655a7e6b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/987a4f1b-2994-459a-a6d8-254e81fea5e8.jpg?resizew=127)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e4f28c096dffd7df54b1162f5b3ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66008c286a899d23bec14885c812d17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
更新时间:2023-12-09 15:04:55
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解答题-问答题
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适中
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【推荐1】如图,点C为线段AB的中点,点E为线段 CB上的点,点D为线段AE的中点,若AB=15,CE=4.5,求线段AD的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/f95fbc5e-a7a7-4d16-9efe-8355d01a288a.png?resizew=237)
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解答题-问答题
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适中
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【推荐2】已知:点C、D、E在直线AB上,且点D是线段AC的中点,点E是线段DB的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876493177077760/2886375196737536/STEM/a14b8cb1-da6a-4e6f-b428-db33f7808dc7.png?resizew=219)
(1)如图1,若点C在线段EB上,且DB=6,CE=1,求线段AB的长;
(2)如图2,若点C是线段EB延长线上任一点,
的值是否变化?若不变,请求出其值.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876493177077760/2886375196737536/STEM/a14b8cb1-da6a-4e6f-b428-db33f7808dc7.png?resizew=219)
(1)如图1,若点C在线段EB上,且DB=6,CE=1,求线段AB的长;
(2)如图2,若点C是线段EB延长线上任一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c6c3b3396916143deb5158a1e4a634.png)
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解答题-证明题
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适中
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【推荐1】所谓黄金分割,指的是把长为L的线段分为两部分,使其中较长部分对于全部之比,等于较短部分对于该部分之比,其比值是
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/3760f417-9e17-4558-87dc-155a6cfb7a91.png?resizew=311)
(1)如图①,在
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,∠ACB的平分线CD交腰AB于点D.请你根据所学知识证明:点D为腰AB的黄金分割点:
(2)如图②,在
中,∠ACB=90°,CD为斜边AB上的高,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/3760f417-9e17-4558-87dc-155a6cfb7a91.png?resizew=311)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71204e3376704fdaca1f0219a317e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ddba2f2cd61f930df48ade7c9e79d2.png)
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解答题-证明题
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适中
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【推荐2】如图,在
中,
、
分别为
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边的垂直平分线,连接
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(1)求证:
;
(2)若
,
,则
的周长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/58ce09b7-28ac-42c5-9fd8-6d661097a87e.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d103d10df3c1ac5fb0e9bfa07953b7a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
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解答题-作图题
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适中
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【推荐1】如图是由小正方形组成的6×6网格,△ABC的三个顶点A、B、C都在格点上.用无刻度的直尺, 运用所学的知识作图(保留作图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/396ddbae-7847-418c-9559-f085e31b2ad1.png?resizew=230)
(1)在图1中作
的高
;
(2)在图2中
的边
上找一点E,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/396ddbae-7847-418c-9559-f085e31b2ad1.png?resizew=230)
(1)在图1中作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf5349b0c224ccfd19ec6966d0bcedb.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,点E在
ABCD内部,EF∥AB,且EF=AB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/806fd949-1b5b-438a-8aac-56976838d38f.png?resizew=171)
(1)求证:△BCE≌△ADF;
(2)设
ABCD的面积为S,四边形AEDF的面积为T,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/806fd949-1b5b-438a-8aac-56976838d38f.png?resizew=171)
(1)求证:△BCE≌△ADF;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0dae23cc439b91a32d1fef130ba48c2.png)
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