如图,已知矩形
中,
是边
上一点,将
沿
折叠得到
,连接
.
(1)初步探究
如图1,当
,
落在直线
上时.
①求证:
;
②填空:
____________;
(2)深入思考
如图2,当
,
与边
相交时,在
上取一点
,使
,
与
交于点
.求
的值(用含
的式子表示),并说明理由;
(3)拓展延伸
在(2)的条件下,当
,
是
的中点时,若
,请直接写出
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80d32bd31d565cd7a5fa4b42dc2e040.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/1c550b93-c984-45ff-bc1e-95822fa0b182.png?resizew=410)
(1)初步探究
如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b7e2fa5b7161f27bd84696ab0e0969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f8340ed411b494829a082dae6db3f8.png)
②填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b440bc2b27918084c5d31d031b3eac1.png)
(2)深入思考
如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6221cb155ffaac074a7aabe838720fb.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b040ca91444b8b1eaade812c58bad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68897994f96dac769c682ae1d563592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)拓展延伸
在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d694b4de9f0bef15f2917a4ed214e01c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f91dd9948741c18e53489adb635f89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
更新时间:2023-10-26 22:33:17
|
相似题推荐
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图1,在平面直角坐标系中,A(8,0),点B在第一象限,△OAB为等边三角形,OC是AB边上的高.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/21f7961e-0987-4679-a5ea-58cc2796ceab.png?resizew=605)
(1)则点C的横坐标________;
(2)图2中,作点C关于y轴对称点D,连接DA,DC分别交OB于点E,F,求证:OE=EF.
(3)图3中,在OC上取点M,连接BM,以BM为边向右作等边△BMN,连接AN,CN;
①求证:OA⊥AN;
②当△BCN周长的最小值时,求∠BNC的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/21f7961e-0987-4679-a5ea-58cc2796ceab.png?resizew=605)
(1)则点C的横坐标________;
(2)图2中,作点C关于y轴对称点D,连接DA,DC分别交OB于点E,F,求证:OE=EF.
(3)图3中,在OC上取点M,连接BM,以BM为边向右作等边△BMN,连接AN,CN;
①求证:OA⊥AN;
②当△BCN周长的最小值时,求∠BNC的度数.
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解题方法
【推荐2】在平面直角坐标中,等腰Rt△ABC中,AB=AC,∠CAB=90°,A(0,a),B(b,0).
(1)如图1,若
+(a-2)2=0,求△ABO的面积;
(2)如图2,AC与x轴交于D点,BC与y轴交于E点,连接DE,AD=CD,求证:∠ADB=∠CDE;
(3)如图3,在(1)的条件下,若以P(0,-6)为直角顶点,PC为腰作等腰Rt△PQC,连接BQ,求证:AP∥BQ.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/1df997ef-0451-47bd-8a7e-1d2195a94063.png?resizew=545)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d1efd2e25ab94744c068484187fbcd.png)
(2)如图2,AC与x轴交于D点,BC与y轴交于E点,连接DE,AD=CD,求证:∠ADB=∠CDE;
(3)如图3,在(1)的条件下,若以P(0,-6)为直角顶点,PC为腰作等腰Rt△PQC,连接BQ,求证:AP∥BQ.
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【推荐1】如图,在
中,
于点
,
.
为等腰直角三角形;
(2)点
在射线
上,连接
,将线段
绕点
逆时针旋转
得到线段
,连接
、
.
①如图
,当点
在线段
上运动时,探究
与
的位置关系,并说明理由;
②当点
在线段
的延长线上运动时,取
的中点
,连接
.请在图
中画出符合题意的图形 ,探究
与
的位置关系,并说明理由;
③在
中,已知
,当点
运动到某一特殊位置时,恰好有
,求此时线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f042c8513aa0d73ed6706f6ac1b36880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae72f6ab712b2730b619cff60207b121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8c3e673f6942831b8431e44409689f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947046ada03c0e6c4ac2360efc458254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图,在
的同侧以
、
为底边向外作等腰
、
,其中
,
为
的中点,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/9d89ab02-246e-44ef-b548-72897cb074a3.png?resizew=385)
(1)如图
,当
时,直接写出
与
的关系.
(2)如图
,当
时,(1)的结论还成立吗?请你做出判断并说明理由;
(3)如图
,当
,
,连接
,取其中点
,若动点A从
的位置运动到
时停止,则
点的运动路径长为______.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff222ea4d07e7f6e4fee759197ad46c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1299d0d6e388b48740053c995a208d0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a36119f4058d8868322a6b4c80eaed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/9d89ab02-246e-44ef-b548-72897cb074a3.png?resizew=385)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5306ee783ec381da6c03d4fb7ecb4395.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d768ffd5bf75080e8ff5ce6b472c0cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】如图,在矩形
中,
,点E、F分别在
上,将四边形
沿着直线
翻折,使得点B落在
边上(不与端点重合),落点记作
,点A的落点记作
.O是
的中点,连接
并延长,与
的延长线交于点G,连接
,
,
,
.
;
(2)若
,设四边形
的面积为S,请求出S关于x的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc025369237c3e5553ee21080df7a816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa23398f4a181c3b4daeab5d7e0fc075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b564c923bdec474b6779a1f8482f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81c9b98ac8e4fb9b92ed98ec82e70ec.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14179abd75fc80ebe25f27af2787f84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9e27e6ab2ef58a8119e48d6d41b339.png)
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【推荐2】根据以下素材,探索完成任务.
折纸确定矩形一边上的三等分点 | |||
素材1 | 第一步:对折正方形![]() ![]() 第二步:将正方形沿对角线 ![]() 第三步:将正方形沿 ![]() ![]() ![]() 第四步:过点G折叠正方形,使点D落在边 ![]() ![]() 则点M即为边 ![]() |
| |
素材2 | 第一步:对折正方形![]() ![]() 第二步:将 ![]() ![]() ![]() 第三步:将点A沿 ![]() ![]() ![]() 则点M即为边 ![]() |
| |
问题解决 | |||
任务1 | 证明素材1或素材2中方法的正确性.(两个素材选一个完成,选择素材1完成满分3分,选择素材2完成满分5分,若两个素材都完成按得分较高的给分.) | ||
任务2 | 已知矩形![]() ![]() |
|
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名校
【推荐1】已知,关于x的二次函数
的图像与x轴交于A、B两点(点A在点B左侧),与y轴交于点C,图像顶点为D,连接AC、BC、BD、CD,满足
.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991345250410496/2994156552560640/STEM/a8b4ac3b-ac77-44c1-9eea-a7d2944f48fa.png?resizew=203)
(1)请直接写出点A、点B的坐标以及a的取值范围;
(2)点
,点F在AC边上,若直线EF平分△ABC的面积,求点F的坐标(用含a的代数式表示);
(3)△BCD中CD边上的高是否存在最大值?若存在,求出这个最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97de2f33bfdf27456267e166a882c51d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7299a2e65eb815ee7176bab85e54557.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991345250410496/2994156552560640/STEM/a8b4ac3b-ac77-44c1-9eea-a7d2944f48fa.png?resizew=203)
(1)请直接写出点A、点B的坐标以及a的取值范围;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24d3fb296026f2ae044602520611fd4.png)
(3)△BCD中CD边上的高是否存在最大值?若存在,求出这个最大值;若不存在,请说明理由.
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解题方法
【推荐2】(1)问题探究:如图1所示,有公共顶点A的两个正方形ABCD和正方形AEFG.AE<AB,连接BE与DG,请判断线段BE与线段DG之间有怎样的数量关系和位置关系.并请说明理由.
(2)理解应用:如图2所示,有公共顶点A的两个正方形ABCD和正方形AEFG,AE<AB,AB=10,将正方形AEFG绕点A在平面内任意旋转,当∠ABE=15°,且点D、E、G三点在同一条直线上时,请直接写出AE的长 ;
(3)拓展应用:如图3所示,有公共顶点A的两个矩形ABCD和矩形AEFG,AD=4
,AB=4
,AG=4,AE=4
,将矩形AEFG绕点A在平面内任意旋转,连接BD,DE,点M,N分别是BD,DE的中点,连接MN,当点D、E、G三点在同一条直线上时,请直接写出MN的长
(2)理解应用:如图2所示,有公共顶点A的两个正方形ABCD和正方形AEFG,AE<AB,AB=10,将正方形AEFG绕点A在平面内任意旋转,当∠ABE=15°,且点D、E、G三点在同一条直线上时,请直接写出AE的长 ;
(3)拓展应用:如图3所示,有公共顶点A的两个矩形ABCD和矩形AEFG,AD=4
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