综合与实践.
【问题发现】
(1)如图1,在正方形
中,
为对角线
上的动点,过点
作
的垂线,过点
作
的垂线,两条垂线交于点
,连接
,求证:
.
【类比探究】
(2)如图2,在矩形
中,
为对角线
上的动点,过点
作
的垂线,过点
作
的垂线,两条垂线交于点
,且
,连接
,求
的值.
【拓展延伸】
(3)如图3,在(2)的条件下,将
改为直线
上的动点,其余条件不变,取线段
的中点
,连接
,
.若
,则当
是直角三角形时,请求出
的长.
【问题发现】
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
【类比探究】
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a12235fc709caecafb64248d2fb8001.png)
【拓展延伸】
(3)如图3,在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1031accbc29195e6a4f7e3ce8cb3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
2024·浙江宁波·模拟预测 查看更多[8]
2024年浙江省宁波市中考数学精准模拟预测题(三)2024年浙江省九年级学业水平考试数学模拟预测题2024年湖北省孝感市高新区中考一模数学试题2024年湖北省阳新县部分学校中考一模数学试题2024年湖北省新中考二模数学试题(省统考)(已下线)考前特训03 几何解答题探究综合压轴题-2024年中考数学二轮热点题型归纳与变式演练(全国通用)2024年湖北省黄石市黄石港区部分学校中考模拟数学试题湖北省黄石市阳新县陶港中学2023-2024学年九年级下学期月考数学试题
更新时间:2024-03-28 14:04:41
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相似题推荐
解答题-证明题
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较难
(0.4)
【推荐1】如图1,已知四边形
是矩形,点
在
的延长线上,
,
与
相交于点
,与
相交于点
,
.
(1)求证:
;
(2)若
,求
的长;
(3)如图2,连接
,请探究线段
、
、
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/1e3f81c8-70da-43d5-a09a-dba32dda6947.png?resizew=389)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f2ab75abc366639a5ca25f6f3d951.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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【推荐2】QQ是大家常用的通讯工具,它的等级、等级图标、活跃天数如下表,请仔细观察,解答下列问题:
(1)等级图标“
”表示第 级,至少需要活跃 天;
(2)设要获得x级至少活跃y天,求y关于x的函数关系式,并求活跃第1000天是哪级?
(3)明叔和亮叔都是从新号(即0级)开始上QQ,明叔每天都获得1活跃天,即第0天至第4天0级,第5天至第11天1级,以此类推:亮叔有时一天都不上QQ,有时进行QQ加速,刚好每50天升一级,即第0天至第49天0级,第50天至第99天1级,以此类推.设明叔第p天处于第n级,亮叔第q天也处于第n级,问n为多少时,q-p最大,最大值是多少?
(1)等级图标“
![](https://img.xkw.com/dksih/QBM/2021/3/8/2673238311878656/2674745797058560/STEM/0904125407f74c2d9ad7bd6faacfd261.png?resizew=34)
(2)设要获得x级至少活跃y天,求y关于x的函数关系式,并求活跃第1000天是哪级?
(3)明叔和亮叔都是从新号(即0级)开始上QQ,明叔每天都获得1活跃天,即第0天至第4天0级,第5天至第11天1级,以此类推:亮叔有时一天都不上QQ,有时进行QQ加速,刚好每50天升一级,即第0天至第49天0级,第50天至第99天1级,以此类推.设明叔第p天处于第n级,亮叔第q天也处于第n级,问n为多少时,q-p最大,最大值是多少?
等级 | 等级图标 | 至少活跃天数 |
0 | 0 | |
1 | 5 | |
2 | 12 | |
3 | 21 | |
4 | 32 | |
5 | 45 | |
6 | 60 | |
7 | 77 | |
8 | 96 | |
… | … | … |
15 | 285 | |
16 | 320 | |
17 | 357 | |
… | … | … |
您最近一年使用:0次
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名校
【推荐1】在平行四边形
中,
于
,
于
,
为直线
上一动点,连接
,
交
于
,且
.
![](https://img.xkw.com/dksih/QBM/2021/4/15/2699976912486400/2704655264145408/STEM/49755987-53ab-4e38-ae6a-d49e7652d2bc.png?resizew=554)
(1)如图1,若
,点
与点
重合为一点,求
的长;
(2)如图2,当
时,求证:
;
(3)如图3,若
,点
是直线
上任一点,将线段
绕
点逆时针旋转
,得到线段
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b3f21848bfd81fd146b026ce3b2e2.png)
![](https://img.xkw.com/dksih/QBM/2021/4/15/2699976912486400/2704655264145408/STEM/49755987-53ab-4e38-ae6a-d49e7652d2bc.png?resizew=554)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784d093b48df0ba4ae15ea1368fe85e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427b30e976cc9bee86ddd0c6cd28b428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d47d4110b8a456ed8c1ceeb5dfbd161.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784d093b48df0ba4ae15ea1368fe85e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4958f25ae5a0ff6c78c38f2f280b2fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30763292d840c0cd6413f66b76e98ab3.png)
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【推荐2】问题情境:如图1,在正方形
中,
,点
是边
上一点(点
不与
重合),将
沿直线
翻折,点
落在点
处.
(1)如图2,当点
落在对角线
上时,求
的长.
(2)如图3,连接
分别交
于点
,点
,连接
并延长交
于点
,当
为
中点时,试判断
与
的位置关系,并说明理由.
(3)如图4,在线段
上取一点
,且使
,连接
,则在点
从点
运动到点
的过程中,
的值是否存在最小值?如果存在,请求出其值;若果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854deb1753fdbc26b47ead1d772deff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26de774fe1f851f2ac9b412c5dbd980a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/ad4b91ff-2cc6-4319-83d8-ce702a48fa8b.png?resizew=638)
(3)如图4,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8ea90c2bbe4111c376e932dea8e097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e64c8b99c60e3f5ac65968d209516ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf89fe4efb7fd3b6fad319de38ae74fa.png)
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名校
【推荐1】【问题背景】如图1,四边形ABCD是正方形,点E是边BC的中点,EF=AE,∠AEF=90°,点G是射线BC上一点,求证:tan∠FCG=1;
证明思路:取AB的中点K,连接EK,证明△AKE≌ECF,所以∠ECF=∠AKE,又可证BK=BE,所以∠BKE=45°,可证∠FCG=45°,从而结论成立;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/18e593b2-e58b-4eee-a1e6-02c66fa4a5b3.png?resizew=522)
(1)【类比证明】在上例中,如图2,如果点E是边BC上与点B不重合的任意一点,其余条件不变,上述结论仍成立吗?如果成立,请证明;若不成立,请说明理由;
(2)【深入探究】如图3,在矩形ABCD中,点E是边BC上与B不重合的任意一点,AB=kAD,AE=kEF,∠AEF=90°,点G是射线BC上一点,则tan∠FCG= ;
(3)【拓展应用】如图4,在Rt△ACB中,∠ACB=90°,点E是边AC上与A不重合的任意一点,AB=kAC,BE=kEF,∠BEF=∠BAC,AE=3,EC=2,点G是射线AC上一点,若CF∥EB,请直接写出此时k的值.
证明思路:取AB的中点K,连接EK,证明△AKE≌ECF,所以∠ECF=∠AKE,又可证BK=BE,所以∠BKE=45°,可证∠FCG=45°,从而结论成立;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/18e593b2-e58b-4eee-a1e6-02c66fa4a5b3.png?resizew=522)
(1)【类比证明】在上例中,如图2,如果点E是边BC上与点B不重合的任意一点,其余条件不变,上述结论仍成立吗?如果成立,请证明;若不成立,请说明理由;
(2)【深入探究】如图3,在矩形ABCD中,点E是边BC上与B不重合的任意一点,AB=kAD,AE=kEF,∠AEF=90°,点G是射线BC上一点,则tan∠FCG= ;
(3)【拓展应用】如图4,在Rt△ACB中,∠ACB=90°,点E是边AC上与A不重合的任意一点,AB=kAC,BE=kEF,∠BEF=∠BAC,AE=3,EC=2,点G是射线AC上一点,若CF∥EB,请直接写出此时k的值.
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解答题-证明题
|
较难
(0.4)
【推荐2】如图1,点
是正方形
的边
上的动点(点
不与点
,
重合),连接
,
于点
,
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/2d371d01-d9af-44f7-809e-c6c1082366d6.png?resizew=259)
(1)求证:
:
(2)如图2,在
上取点
,使得
,作
的角平分线交
的延长线于点
,直接写出
的值;
(3)如图2,在(2)的条件下,连接
.当点
运动时,试探究
的值是否为定值?若是定值,请求出该定值;若不是定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b2543a38e7cbf69aa881f764c2b8b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/2d371d01-d9af-44f7-809e-c6c1082366d6.png?resizew=259)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8f95cfdfd12469e054bd1d014809f5.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b1e48b189ed48dc8cd4edc0ae7bc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a082f53b6c5a25fc13cafce02d162c9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a15097ee78f60d4d870b05d830d4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ab951f8dfa28f40299088ea617673.png)
(3)如图2,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb97ba172e2df77899030070c92534a.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,在四边形
中,
.将四边形
沿
折叠,点C的对称点E落在边
上,
.
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670835205849088/2676227391897600/STEM/7e959f6d-47d0-42b9-9848-b63a327e8440.png)
(1)求证:四边形
是矩形;
(2)求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ce42bdf91bbb0ae258fef6de19bf95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8526f53f9bcca5e5e264e398897aa221.png)
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670835205849088/2676227391897600/STEM/7e959f6d-47d0-42b9-9848-b63a327e8440.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,锐角三角形
内接于圆O,
, D是
弧上一点,连接
,
与
交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/dd6d05a9-14a5-47eb-807e-53d1a42d1ff0.png?resizew=126)
(1)若
恰好过圆心O,且
平分
.
①若圆的半径为2,求
的长;
②求证:
;
(2)若
,且圆O的半径为r,
,求
的长(用r的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89247596ac11a225067e7ce44c0e7b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/dd6d05a9-14a5-47eb-807e-53d1a42d1ff0.png?resizew=126)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
①若圆的半径为2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107673e9909bc69347af8424d5160e2e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d602d6b972a14c3933906283b61a2a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
您最近一年使用:0次