名校
1 . 如图,已知
中,
,D为斜边
上一点,
.
![](https://img.xkw.com/dksih/QBM/2020/11/16/2599039317303296/2610675923812352/STEM/1f4719a796274c4c9b810fa4b2991ff1.png?resizew=354)
(1)如图1,当
,求
的长;
(2)如图2,作
于点F,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902479ae42ea9adddae27f2364a5309f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262a173a7cf68e06b4be175df69e2b74.png)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2599039317303296/2610675923812352/STEM/1f4719a796274c4c9b810fa4b2991ff1.png?resizew=354)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a16d3e0f1d5735d32ae16bf71b34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c810f1ffd122e63cc04c44ef785153.png)
您最近一年使用:0次
2 . 如图1,矩形
中,
,E、F分别在
、
上,四边形
为菱形,P是边
上的一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5491c9d6-9f7e-4a26-85ab-65054e79451c.png?resizew=198)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/d521093d-6c94-485f-bc34-dd7fcc16fcbb.png?resizew=219)
(1)
____,
__;
(2)当
的周长最小时,求
的值;
(3)如图2,连接
交
于点M,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c84f75f412b897e3162efb783dbd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c77092e17176caf1be465841440c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5491c9d6-9f7e-4a26-85ab-65054e79451c.png?resizew=198)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/d521093d-6c94-485f-bc34-dd7fcc16fcbb.png?resizew=219)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919b74c41cb735f76de05ad705c6466.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a17c82ab8741b98e3fa9481ac117b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
名校
3 . 如图,在
中,
,
,
,若
,
,则AC的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8b131c1d7d61da9ddac51dd3ca4ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38ea0df0ed6bd06b10497ea0e204fbd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/208e7802-61bd-4cce-81db-00f389063f05.png?resizew=146)
您最近一年使用:0次
名校
4 . 如图,矩形
中,
为
上一点,
为
上一点,分别沿
,
折叠,
,
两点刚好都落在矩形内一点
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aa02e18c968b984a2fadbf8784c299.png)
______ .
![](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/9d78abbad68bbbf12af10cd40ef4c353.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/b9f79d7939c88e9702962e5917cad290.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c7b0e15bfcf4bd7214320bc40f5373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aa02e18c968b984a2fadbf8784c299.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/9686e3cc-063c-4546-aef9-9b572ba6126f.png?resizew=164)
您最近一年使用:0次
2020-12-08更新
|
371次组卷
|
3卷引用:浙江省杭州市滨江区2019-2020学年八年级下学期期末数学试题
浙江省杭州市滨江区2019-2020学年八年级下学期期末数学试题广东省深圳市福田区深圳实验学校初中部2020-2021学年九年级上学期期中数学试题(已下线)【新东方】初中数学977【2020年】【初二下】
5 . 如图,在长方形纸片
中,
,
,将长方形纸片折叠,使点
落在
边的点
处,折痕为
,此时
.
(1)求
的值;
(2)在
边上是否存在一个动点
,且不与点
、
重合,使
的周长最小.如果存在求出
的周长最小值:如果不存在,请说明理由;
(3)若点
,
是
边上的两个动点,且不与点
,
重合,
.当四边形
的周长最小时,其周长的最小值是______.
![](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/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcad23fd44f0c58d0def5a6ddf22e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb3465d2beda0240e452d25501316bd.png)
![](https://img.xkw.com/dksih/QBM/2020/11/10/2592786583642112/2607572504625152/STEM/ae4eb504-5376-443c-947f-649da94572cf.png)
您最近一年使用:0次
6 . 如图,将一个
智屏手机抽象成一个的矩形
,其中
,
,然后将它围绕顶点A逆时针旋转180度,旋转过程中A、B、C、D的对应点依次为A、E、F、G,则当
度时,若旋转角为
,则α的大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179a195539b5c86aecce9f590ae9c9a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede0bcdce110dbe6f46a4a7ba7e6059d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17327a9ba820e0dd5e405125f6eb044f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c3f3b773468b6c41669066057d8932.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/9612adaf-4aa2-4eef-9259-ac07b3c93a4e.png?resizew=181)
您最近一年使用:0次
7 . 在长方形
中,
,
,
是
边上一点,连接
,把
沿
折叠,使点
落在点
处,当
为直角三角形时,求
的长.
![](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/e65a3e478bb87d094e3a0af30dd10ae8.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d815a580f50aadfebaba48827d64fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599815327924224/2600760036040704/STEM/671a483bce4644348cae6fa7389017cf.png?resizew=163)
您最近一年使用:0次
8 . 如图,已知矩形
的边长
,
.动点
从
出发,在边
上以
的速度向
点匀速运动,同时,动点
从
出发,在边
上以
的速度向
点匀速运动,
与
相交于点
.
(1)经过多少时间,
的面积等于矩形
面积的
?
(2)是否存在时刻
,使以
、
、
为顶点的三角形与
相似?若存在,求
的值;若不存在,请说明理由.
(3)求
为何值时,
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d92d5d2adfe12d5edd03e038c0b4e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8b79e8117dbbe73418dce43aa08ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d9874458f23da054ee0a7435a71f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ddc6c8e8316243479361a001fce194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/66a34f7e-a7f5-4fd1-a5d4-0ab5e80a7367.png?resizew=389)
(1)经过多少时间,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d7abf02717d6e59d8a64a65a87c412.png)
(2)是否存在时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bdaf7b0396305bad6572311388333e5.png)
您最近一年使用:0次
9 . 已知在
中,
,
,直线
经过点
,过点
、
分别向直线
作垂线,垂足分别为
、
,
交
于点
.
(1)如图,若
,求证:
.
(2)如图2,若
,则
、
、
之间的数量关系是______.
(3)在(2)的条件下,如图3,连接
,过点
作
,交
延长线于点
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cfd2a95ad9cf4d9e236bdaa754f719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe608ce9338ab5cbd4d5decce7f899a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/09c92186-5001-4b7e-9cb6-914fda904ef9.png?resizew=126)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/71e92756-c939-40e6-8b5a-fb256b9ce009.png?resizew=154)
(3)在(2)的条件下,如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278300add1fd1505b59306e4c705e8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1961a943c14101f304bdce7704cdea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e82a0052299f414cff1e7afcc5aa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/05a0ce3a-4e5c-40ae-8c79-29a66c665ad2.png?resizew=165)
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10 . 某数学课外兴趣小组成员在研究下面三个有联系 的问题,请你帮助他们解决:
(1)如图1,矩形ABCD中,AB=8,BC=6,将矩形对折,使得点B、点D重叠,折痕为EF,过点F作AB的垂线交AB于点G,求EF的长;
(2)如图2,矩形ABCD中,AB=a,BC=b,点E,F分别在AB,DC上,点G,H分别在AD,BC上且EF⊥GH,求
的值;
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=8,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
的值.
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589307275059200/2594726952288256/STEM/dfdc1a109cb1420085c97666591b3293.png?resizew=476)
(1)如图1,矩形ABCD中,AB=8,BC=6,将矩形对折,使得点B、点D重叠,折痕为EF,过点F作AB的垂线交AB于点G,求EF的长;
(2)如图2,矩形ABCD中,AB=a,BC=b,点E,F分别在AB,DC上,点G,H分别在AD,BC上且EF⊥GH,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d12504c6da5f94ba2656ca727c2fe82.png)
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=8,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f710f8f1fa0df203765d18692ded6a91.png)
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