如图,已知在Rt△ABC中,∠C=90°,∠CAB=60°,AB=10,点F是AB中点,点D是射线CB上的一个动点,△ADE是等边三角形,联结EF.
①求证:△AEF≌△ADC;
②联结BE,设C、D间距离为x,
,求y关于x的函数解析式及定义域;
(2)当∠DAB=15°时,求△ADE的面积(直接写出答案).
①求证:△AEF≌△ADC;
②联结BE,设C、D间距离为x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493e35563032e397cad7ca02a3848fb5.png)
(2)当∠DAB=15°时,求△ADE的面积(直接写出答案).
21-22八年级上·上海·期末 查看更多[3]
(已下线)上海期末解答精选50题(压轴版)-2021-2022学年八年级数学上学期期中期末考试满分全攻略(沪教版)(已下线)第19章 几何证明(B卷·能力提升练)-【单元测试】2022-2023学年八年级数学上册分层训练AB卷(沪教版上海)上海市青浦区教师进修学院附属中学2023-2024学年八年级上学期期末数学试题
更新时间:2022-05-28 22:23:42
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解答题-证明题
|
较难
(0.4)
【推荐1】(1)问题背景.
如图1,在四边形
中,
,
,
、
分别是线段
、线段
上的点.若
,试探究线段
、
、
之间的数量关系.
小明同学探究此问题的方法是,延长
到点
.使
.连接
,先证明
.再证明
,可得出结论,他的结论应是____________.
(2)猜想论证.
如图2,在四边形
中,
,
,
在线段
上、
在线段
延长线上.若
,上述结论是否依然成立?若成立说明理由;若不成立,试写出相应的结论并给出你的证明.
(3)拓展应用.
如图3,在四边形
中,
,
,AD平分
,
,
,
且
,求四边形
的面积.
如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f585c8a84491d24cdbf724660d7b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/4dd54f82-db2e-4a3f-b8ee-e0ff57a58ba6.png?resizew=157)
小明同学探究此问题的方法是,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac09e961b25848c2860065aa8f577e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382dcc8aa37ed16c588b41888c3906a7.png)
(2)猜想论证.
如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd602a957d7f6d0940f79a1121b78c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f585c8a84491d24cdbf724660d7b521.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/4c8b5064-dfb3-419e-99ee-43808fc61b3a.png?resizew=166)
(3)拓展应用.
如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5489aaa6dc00789fcf126bf2fd744a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151507a3b182377e8efa15f6e4fb2f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/cc2f02cb-c0b9-415e-8eb7-06c1d6d869d2.png?resizew=115)
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【推荐2】如图,
和
是等腰三角形且
,
,垂足为
.
的理由
(2)猜想
和
的位置关系,并说明理由;
(3)试说明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be269a5c2f54739884dbfaa364562d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d420f305d8867cb28b786feb0e07b808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ebb923961cca16970cc013141dc2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab9759f979948a7568ddc9464a84331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b2071331f238746f1f76884edec3a2.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(3)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65605e068ae02bce193355adab356e9b.png)
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【推荐1】(1)问题发现:如图①,
和
都是等边三角形,点B、D、E在同一条直线上,连接
.
①
的度数为______;
②线段
之间的数量关系为______;
(2)拓展探究:如图②,
和
都是等腰直角三角形,
,点B、D、E在同一条直线上,
为
中
边上的高,连接
,试求
的度数及判断线段
之间的数量关系,并说明理由;
(3)解决问题:如图③,
和
都是等腰三角形,
,点B、D,E在同一条直线上,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fae5286f4db94b807b631ff00c45b3.png)
(2)拓展探究:如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7e1c8879bad44f117ecc8342201754.png)
(3)解决问题:如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a25792a7b9da92f68f67f391862f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddb1f5e10f81e1345d67af156f0d23d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/67c192ac-a507-44db-a9af-469d5f7bdff2.png?resizew=461)
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解答题-问答题
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较难
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【推荐2】图1是边长分别为
和
的两个等边三角形纸片
和
叠放在一起(
与
重合)的图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/c948f23a-fab7-4c2d-a945-f6130d3fad0c.png?resizew=456)
(1)操作:固定
,将
绕点C按顺时针方向旋转20°,连结AD,BE,如图2,则
______度,并直接写出线段BE与AD的数量关系____.
(2)操作:若将图1中的
,绕点C按顺时针方向旋转120°,使点B、C、D在同一条直线上,连结AD、BE,如图3.
①线段BE与AD之间是否仍存在(1)中的结论?若是,请证明;若不是,请直接写出BE与AD之间的数量关系;
②求
的度数.
(3)若将图1中的
,绕点C按逆时针方向旋转一个角
,当
等于多少度时,
的面积最大?请直接写出答案.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc1ee7f9f3c497125ee3f9e44db9688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/c948f23a-fab7-4c2d-a945-f6130d3fad0c.png?resizew=456)
(1)操作:固定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e7a62af4f7d0f53ed66d724a606fea.png)
(2)操作:若将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
①线段BE与AD之间是否仍存在(1)中的结论?若是,请证明;若不是,请直接写出BE与AD之间的数量关系;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)若将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120ccdfeba94de3710f077018ce27b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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名校
【推荐3】综合与实践
问题情境:数学活动课上,老师出示了一个问题:如图1,点D在等边
的边
上,将线段
绕点A逆时针旋转
得到
,连接
.试猜想
与
的数量关系,并加以证明.
(2)实践探究:希望小组受到启发,如图2,点D为等边
内一点,将线段
绕点A逆时针旋转
得到
,连接
,若
的延长线经过点E,求
的度数.
(3)问题解决:智慧小组突发奇想,如图3,点D为等边
内一点,将线段
绕点A逆时针旋转
得到
,连接
,
的延长线与
交于点F,连接
.智慧小组对该图形进行探究,得出结论:
.智慧小组的结论是否正确?若正确,请给出证明;若不正确,请说明理由.
问题情境:数学活动课上,老师出示了一个问题:如图1,点D在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)实践探究:希望小组受到启发,如图2,点D为等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
(3)问题解决:智慧小组突发奇想,如图3,点D为等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a78e94711850dc740ff96bc73ac558.png)
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【推荐1】在平面直角坐标系中,点O为坐标原点,点P在抛物线
上.设点P的横坐标为m,记抛物线对称轴与x轴的交点为 D.
(1)求点D的坐标;
(2)若
时,
,则m的取值范围为 ;
(3)点M的横坐标为
,且
轴,将线段
的中点绕点P逆时针旋转
得到点Q, 以
、
为邻边作矩形
.
①当点N落在抛物线时,求
的长;
②设矩形
的对称中心为点 R,当点R位于抛物线的对称轴右侧时,连接
,当
垂直于矩形
的一条对角线时,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1421a546a388b4f892bcd8a7ff628d0c.png)
(1)求点D的坐标;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7091c49074f62962862ba440a87802a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b5c4d3775a39e1af26b2fe56fe7080.png)
(3)点M的横坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a7d8a76004e123134a7837e22941ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f2515ae7bc5ab23505b430c4158e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7521a7df2118a17d09d23c31d2cf107.png)
①当点N落在抛物线时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
②设矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec780e86f57790cf88ec761e219bf5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638f89746a35b59f1b492ef20ca85156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638f89746a35b59f1b492ef20ca85156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec780e86f57790cf88ec761e219bf5f.png)
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解答题-证明题
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较难
(0.4)
【推荐2】
(1)如图1,在正方形
中,点E,F分别在边
,
上,且
,连接
,
.求证:
,
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/78341828-26a9-43d8-ab83-a9b51a4cd0b7.png?resizew=602)
(2)如图2,若将边长为4的正方形
折叠,使得点A落在
的中点E处,折痕为
,点G在
边上,点F在
边上,则折痕
_________;
(3)如图3,在正方形
中,
,
,则
的最小值为_________.(直接填空)
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/78341828-26a9-43d8-ab83-a9b51a4cd0b7.png?resizew=602)
(2)如图2,若将边长为4的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](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/10f1f15400d48e7b756e87e3f566aabe.png)
(3)如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74df87fcc553dcb1d4d042252383b037.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在
中,
,
,
,
是边
上不与点
、
重合的任意一点,
,垂足为点
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895218968584192/2896548244201472/STEM/f267a7b9-ba64-4cc0-ab97-2cc346254a39.png?resizew=214)
(1)求证:
;
(2)如果设
,
,求
与
的函数解析式,并写出函数的定义域;
(3)当
的面积为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895218968584192/2896548244201472/STEM/f267a7b9-ba64-4cc0-ab97-2cc346254a39.png?resizew=214)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccc2bba2ab24022ce3ad33a6709da04.png)
(2)如果设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d735b47d57bec8a544cf99edf64f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4013f8d06666aa51025ea0cb818ac124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图1,在正方形
中,点E是边
上一点,且点E不与点
重合,点F是
的延长线上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/7080a894-97b9-4b41-9a20-7005becd9af7.png?resizew=319)
(1)求证:
;
(2)如图2,连接
,交
于点K,过点D作
,垂足为H,延长
交
于点G,连接
.
①求证:
;
②若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6b93dbe5272a5167ff4e2918bec864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/7080a894-97b9-4b41-9a20-7005becd9af7.png?resizew=319)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/873c23823e616e26c48ff5725e202039.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c7463007d99a434dd274069b6f0f93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a7684e8b13ef5324ecc97be5fc5924.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4963bd4f548dfd3f4dd026dd1e273ac9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930d6513a725568cda099e6f7965073c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
您最近一年使用:0次