【初步尝试】
(1)如图1,在正方形
中,点
,
分别为
、
边上的点且
,求证:
.
(2)【思考探究】
如图2,在矩形
中,
,
,点
为
中点,点
为
上一点,连接
、
且
,求
的值.
(3)【拓展应用】
如图3,在四边形
中,
,
,
,点
、
分别在线段
、
上,且
.直接写出
的值.
(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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
(2)【思考探究】
如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebb5baea4ac1668b674a8634e15bcbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(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/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07aa4ebe8eca7c655c5960f7c1f1bdca.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b670ec1599330f6af99c600404afcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/0c82d814-0a0d-4428-87ed-91ff6bc475e2.png?resizew=497)
2023·安徽合肥·一模 查看更多[2]
更新时间:2023-04-19 19:13:58
|
相似题推荐
解答题-证明题
|
较难
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【推荐1】如图,在
中,
,
,
是线段
上的一点,连接
,过点
作
,分别交
,
于点
,
,与过点A且垂直于
的直线相交于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/8246aeca-055a-4153-ac5f-7fa116fa38ff.png?resizew=147)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b02791d9414f0d87cce7205578e6ca0.png)
(2)若
是
的中点,求
的值.
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54772dd379d3c6c1a1c4f0f00690ced6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/8246aeca-055a-4153-ac5f-7fa116fa38ff.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b02791d9414f0d87cce7205578e6ca0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f7c1fd715395858fef59913b8d9262.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f37b9de09f3b48f1c6cd3f373e41dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dba7fb5fc911a992acf2ca0bb9c30bd5.png)
您最近一年使用:0次
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|
较难
(0.4)
【推荐2】综合与实践:
动手操作:某数学课外活动小组利用图形的旋转探究图形变换中蕴含的数学奥秘.如图1,
是等腰直角三角形,
,
,将边
绕点B顺时针旋转
得到线段
,连接
,过点
作
交
延长线于点D.
思考探索:(1)在图1中:
的面积为 ;
拓展延伸:(2)如图2,若
为任意直角三角形,
.将边
绕点B顺时针旋转
得到线段
,连接
,过点
作
交
延长线于点D.猜想三条线段
、
、
的数量关系,并证明.
(3)如图3,在
中,
,
,将边
绕点B顺时针旋转
得到线段
,连接
.若点D是
的边
的高线上的一动点,连接
、
,则
的最小值是 .
动手操作:某数学课外活动小组利用图形的旋转探究图形变换中蕴含的数学奥秘.如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17069b9dd77505467e9562fe8bc68b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
思考探索:(1)在图1中:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2df93bd15f25096c510b589aad0dfc1.png)
拓展延伸:(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17069b9dd77505467e9562fe8bc68b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3c5d2cbe5cfa47fde68ff3b5b81469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e055d012a9b8f2d3274a397270c51aa8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/e2c408a1-d59a-4632-aaa1-6be963c40ee8.png?resizew=498)
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【推荐1】我们知道:两组对边分别平行的四边形叫做平行四边形.类比平行四边形的定义,给出平行六边形的定义:三组对边分别平行的凸六边形叫做平行六边形.数学兴趣小组的同学对其性质进行了探究.如图1,在平行六边形
中,
,
与
的数量关系,并证明你的结论;
(2)如图2,若
,则
与
相等吗?请说明理由;
(3)如图3,在(2)的条件下,连接
,则
与平行六边形
的面积之比是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd433c5d97bf5f66e94967373d0b194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed01d7ecee9ee322e3fa8578c8ab4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
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解题方法
【推荐2】在平行四边形
中,
、
、
、
平分线分别为
、
、
、
,
与
交于点
,
与
交于点
,
与
交于点
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727857229635584/2779551193743360/STEM/6c7ebec1-1ed2-4f56-8d0e-683b61bf6ed0.png?resizew=544)
(1)如图(1),已知
,此时点
、
分别在边
、
上,
①四边形
是__________.
A. 平行四边形 B. 矩形 C. 菱形 D. 正方形;
②请判断
与
的位置关系和数量关系,并说明理由;
(2)如图(2),分别过点
、
作
、
,分别交
、
于点
、
,连接
、
.求证:四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95efaa2bb4dce0f63f4a23e0f29c5aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727857229635584/2779551193743360/STEM/6c7ebec1-1ed2-4f56-8d0e-683b61bf6ed0.png?resizew=544)
(1)如图(1),已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
A. 平行四边形 B. 矩形 C. 菱形 D. 正方形;
②请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图(2),分别过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25b74106ae1e9bbabe5e1ba8829c5d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618272406dc07bcfc4a89951a51d94a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37950822caffeb73674a6ca5375b8d5.png)
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【推荐3】在学习三角形高线时,发现三角形三条高线交于一点,我们把这个交点叫做三角形的垂心.课后小明同学继续探究,上网搜索得到了三角形重心的一条性质,制作了如下表格进行探究.
(1)表格中①处应填: .
(2)小明先选择了直角三角形来探究重心的性质,写出了已知求证,请完成证明.
已知:如图1,⊙O是
的外接圆,
,H是
的垂心,
,垂足为E.
求证:
.
(3)如图2,⊙O是锐角三角形ABC的外接圆,高线AF与高线CG交于点H,
于点E,为了证明
.小明想把锐角三角形的问题转化为直角三角形,为此他过点B作了⊙O的直径BD,请继续小明的思路证明.
三角形关型 | 直角三角形 | 锐角三角形 | 钝角三角形 |
垂心的位置 | 直角顶点 | ① | 在三角形外部 |
垂心的性质 | 三角形任意顶点到垂心的距离等于外心到对边的距离的两倍. | ||
图形 | 图1 | 图2 |
(2)小明先选择了直角三角形来探究重心的性质,写出了已知求证,请完成证明.
已知:如图1,⊙O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4a5a26b460a47e433bfac4f6d0af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c4bcc71c6ba24301e364c29a6a05a.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa421d1d35ef67730088476160016b3.png)
(3)如图2,⊙O是锐角三角形ABC的外接圆,高线AF与高线CG交于点H,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c4bcc71c6ba24301e364c29a6a05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa421d1d35ef67730088476160016b3.png)
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【推荐1】如图,在矩形ABCD中,点M在AB或AD边上,点N在BC边上,沿直线MN折叠矩形,点B落在点E处.
(1)如图①,当点M,E都在AD上时,连接BM,求证:四边形MBNE是菱形;
(2)如图,
,
,
,当点M在AB上,点E在AD上时,求MN的长;
(3)我们定义:一条对角线是另一条对角线的二倍的四边形是“倍长四边形”.如图,点M在AD上,连接BE交CD于点P,若
,求证:四边形BMPN是“倍长四边形”.
(1)如图①,当点M,E都在AD上时,连接BM,求证:四边形MBNE是菱形;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/215fb7a6-53e0-41f2-b646-e10f993c318a.png?resizew=140)
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941eba4dbc1094107e1eeb02c8d8cd56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/a748db2b-bb79-44fb-8853-1a3af92da371.png?resizew=141)
(3)我们定义:一条对角线是另一条对角线的二倍的四边形是“倍长四边形”.如图,点M在AD上,连接BE交CD于点P,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/0a5235b6-2394-4643-b50c-592391efd5cb.png?resizew=170)
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名校
【推荐2】在四边形
中,点
,
分别是边
,
上的点,连接
、
并延长,分别交
,
的延长线于点
、
,连接
.
是正方形,
,求证:
;
(2)如图2,若四边形
是菱形,
,
,
,求
的长;
(3)如图3,若四边形
是矩形,
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96461af9193d5d7867ddf8fcbefcaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8accaaedf7637dee47dc894f26120bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871a5d2e6840a67145b39698dcf7b038.png)
(2)如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0880fcd038a82649d0e55227c576362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b459a149642d36cdff1e54bf1e051e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ff6aef2a6a90360d2b52ae33d7935c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
(3)如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c7d0f25be42caecc324b37356520fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c52d640e62f896bd3cc16d82f4f553c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ae577822dbc938b03c97fb993cf655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7158f207adb18dcb48d5f0e442dd94.png)
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【推荐1】如图,在边长为4cm的等边△ABC中,AD⊥BC于D,点P、Q分别从B、C两点同时出发,其中点P沿BC向终点C运动,速度为1cm/s,点Q沿CA、AB向终点B运动,速度为2cm/s,设它们的运动时间为
(s).
(1)当
为何值时,PQ⊥AC;
(2)当
时,求证:AD平分△PQD的面积;
(3)探索以PQ为直径的圆与AC的位置关系,请写出相应位置关系的
的取值范围.(不要求写出过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e482dd69ac1cf7f06552fdf25a217c.png)
(3)探索以PQ为直径的圆与AC的位置关系,请写出相应位置关系的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2020/12/1/2604879342452736/2611394398404608/STEM/be0fbd6390bb46a5a07b689cf29f4573.png?resizew=155)
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【推荐2】如图,在等边
中,
.点P从点A出发以每秒2个单位的速度沿边
向终点B运动,过点P作
于点D,过点P向上作
,且
,以
、
为边作矩形
.设点P的运动时间为x(秒),矩形
与
的重叠部分图形的面积为y.
的长;
(2)求出当点F落在边
上时x的值;
(3)求在运动过程中y与x之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951b9f77413d5f062acb300b09de1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a333a382efa714ee244945fa4c5f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be77ab9555c825b6c038e0aaf3051013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f107bd06ad6af2ff8d5aaa9ace12d9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f107bd06ad6af2ff8d5aaa9ace12d9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(2)求出当点F落在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)求在运动过程中y与x之间的函数关系式.
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【推荐3】如图,在平行四边形ABCD中,AD="4" cm,∠A=60°,BD⊥AD. 一动点P从A出发,以每秒1 cm的速度沿A→B→C的路线匀速运动,过点P作直线PM,使PM⊥AD .
![](https://img.xkw.com/dksih/QBM/2012/7/30/1573472305422336/1573472343162880/STEM/89c2f07a66f54364a1a28938dddef853.png)
(1)当点P运动2秒时,设直线PM与AD相交于点E,求△APE的面积;
(2)当点P运动2秒时,另一动点Q也从A出发沿A→B→C的路线运动,且在AB上以每秒1 cm的速度匀速运动,在BC上以每秒2 cm的速度匀速运动. 过Q作直线QN,使QN∥PM. 设点Q运动的时间为t秒(0≤t≤10),直线PM与QN截平行四边形ABCD所得图形的面积为S cm2.
① 求S关于t的函数关系式;
② 求S的最大值.
![](https://img.xkw.com/dksih/QBM/2012/7/30/1573472305422336/1573472343162880/STEM/89c2f07a66f54364a1a28938dddef853.png)
(1)当点P运动2秒时,设直线PM与AD相交于点E,求△APE的面积;
(2)当点P运动2秒时,另一动点Q也从A出发沿A→B→C的路线运动,且在AB上以每秒1 cm的速度匀速运动,在BC上以每秒2 cm的速度匀速运动. 过Q作直线QN,使QN∥PM. 设点Q运动的时间为t秒(0≤t≤10),直线PM与QN截平行四边形ABCD所得图形的面积为S cm2.
① 求S关于t的函数关系式;
② 求S的最大值.
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