1 . 已知抛物线
与
轴交于点
、
(点
在点
的右侧),与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532610764808192/2532713409593344/STEM/09c343a2959843c2af5c14f9432503ac.png?resizew=432)
(1)如图1,点
为抛物线顶点,以点
为圆心,1为半径作⊙A,点
为⊙A上的动点,连接
、
,求
的最小值;
(2)如图2,若点
是直线
与抛物线对称轴的交点,以
为圆心,以1为半径作⊙H,点
是⊙H上一动点,求
的最小值;
(3)如图3,点
是抛物线上的点,且横坐标为2,过点
作
轴于点
,点
是以
为圆心,1为半径的⊙O上的动点,连接
、
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532610764808192/2532713409593344/STEM/09c343a2959843c2af5c14f9432503ac.png?resizew=432)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d484bf02cff33fd2121ae1db6d8dfe1.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674a39387320dc76db1489d0da3e48d3.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca8e046874e53ca65d602f85b8602ae.png)
您最近一年使用:0次
解题方法
2 . 如图所示,在矩形
中,
,
,
为
的中点,
为
上一动点,
为
的中点,连接
,求
的最小值.
![](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/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532611998654464/2532698481942528/STEM/57a55bb962904ca68ca99ea3c8f486c8.png?resizew=124)
您最近一年使用:0次
3 . 将一副直角三角尺按图①所示位置摆放,其中
,
,
,
,等腰直角三角尺的直角边
恰好垂直平分
,与
相交于点
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b44f4a0f30581bc6dc6ff92655e87c3.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532611512221696/2532677832081408/STEM/9addae7c5f5e4cdbbd9c5e8ceac85adb.png?resizew=554)
(1)求
的长;
(2)如图②,将
绕点
按顺时针方向旋转,当直角边
经过点
,另一直角边
与
相交于点
时,分别过点
,
作
,
的垂线,垂足分别为点
,
.猜想
与
之间的数量关系,并说明理由;
(3)将两个全等的等腰直角三角尺按如图③所示位置摆放,
,
,
与
交于点
,
与
交于点
,将
沿
水平平移,求平移过程中
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0ae8b73d3da30c91848d9a473a7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b44f4a0f30581bc6dc6ff92655e87c3.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532611512221696/2532677832081408/STEM/9addae7c5f5e4cdbbd9c5e8ceac85adb.png?resizew=554)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
(3)将两个全等的等腰直角三角尺按如图③所示位置摆放,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478338c337a5b537dea8dff60b93b5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec67259153551e67bb3e035d11dc9334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece895cbddf9d1f37f75e3b6346edda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf6e3fc246ccd99513bdcfbd3aa0bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e07b15cfb3b56c8a836832a85c0d1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5529046d232de846352a439d991439.png)
您最近一年使用:0次
4 . 如图,在矩形
中,点
在
轴上,点
在
轴上,点
的坐标是
.矩形
沿直线
折叠,使得点
落在对角线
上的点
处,且直线
与
轴分别交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/7e0cbe01-f302-4c9b-8de9-0c4c48edcba2.png?resizew=184)
求线段
的长;
求
的面积;
在
轴上是否存在点
使得以
为顶点的四边形是平行四边形?若存在,请求出满足条件的
点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d91618fa59d503b1eac946f6bca6d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ff20163ec7c712549983e74460f02b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc8418304a82ed7a5b2341fc724c12f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/7e0cbe01-f302-4c9b-8de9-0c4c48edcba2.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98914a2f34d457acf18e36d3b6eac5f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0677f0e0618c39a6687ee696dfacf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2020-08-20更新
|
405次组卷
|
2卷引用:云南省昭通市2019-2020学年八年级下学期期末数学试题
5 . 如图,矩形ABCD中,点E在边CD上,将△BCE沿BE折叠,点C落在AD边上的点F处,过点F作FG∥CD交BE于点G,连接CG.
(1)求证:四边形CEFG是菱形;
(2)若BC=10,cos∠ABF
,求菱形CEFG的边长.
(1)求证:四边形CEFG是菱形;
(2)若BC=10,cos∠ABF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bdc7032d7d88778cf61028a6b4ba67.png)
![](https://img.xkw.com/dksih/QBM/2020/8/18/2530294686941184/2530679942324224/STEM/1bc9061148304ce591f6a253de73438c.png?resizew=168)
您最近一年使用:0次
6 . 如图,四边形纸片
中,
,
.若该纸片的面积为10 cm2,则对角线
=______ cm.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/fab4e136-4b6d-4f04-baff-1d74d749c22a.png?resizew=112)
您最近一年使用:0次
解题方法
7 . 在四边形
中,
,
平行于
,
,
,点
在线段
上,联结
,过点
作
,与
交于点
,设
的长为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/db462725-28c8-4ae0-a884-06b461c24bb6.png?resizew=221)
(1)当
时,求线段
的长;
(2)设
的面积为
,求
关于
的函数关系式,并写出自变量
的取值范围;
(3)当
与
相似时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.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/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9425630dcfe5a824c44904d4f71e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/db462725-28c8-4ae0-a884-06b461c24bb6.png?resizew=221)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd50cf631e459b58b180cdf2f57844c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc34a42e6838de94da6dc08e0b578cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db8b0f0ac45b16388d408a60e69bcdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a545b49d4d7c86888a75b6cf97b59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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8 . 如图,矩形ABCD中,AB=4,AD=8,E为BC的中点,F为DE上一动点,P为AF中点,连接PC,则PC的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/5b65fedb-2789-4ab7-bea2-eb9b62125d94.png?resizew=196)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/5b65fedb-2789-4ab7-bea2-eb9b62125d94.png?resizew=196)
A.4 | B.8 | C.2![]() | D.4![]() |
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2020九年级上·全国·专题练习
9 . 如图①,正方形ABCD的边长为2,点P是正方形ABCD内一点,连结PA,PB,PD,△PAB为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/fd5fa21f-5c44-4576-8599-1be289b3f76c.png?resizew=263)
(1)求点P到边AD,AB的距离之和;
(2)如图②,连结BD交PA于点E,求△PBD的面积以及
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/fd5fa21f-5c44-4576-8599-1be289b3f76c.png?resizew=263)
(1)求点P到边AD,AB的距离之和;
(2)如图②,连结BD交PA于点E,求△PBD的面积以及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e8bfce771b57157637bab2ca276df8.png)
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2020九年级上·全国·专题练习
10 . 如图①,△ABC中,∠ACB=90°,点D从点A出发沿A→C方向匀速运动,速度为1cm/s.点E是AC上位于点D右侧的动点,点M是AB上的动点,在运动过程中始终保持MD=ME,DE=2cm.过M作MN∥AC交BC于N,当点E与点C重合时点D停止运动.设△MDE的面积为S(cm2),点D的运动时间为t(s),S与t的函数关系如图②所示:
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526403436339200/2526506026500096/STEM/8d9525414bb04aa2b93a4db83c857d5f.png?resizew=275)
(1)AC= cm,BC= cm;
(2)设四边形MDEN的面积为y,求y的最大值;
(3)是否存在t的值,使得以M,E,N为顶点的三角形与△MDE相似?如果存在,求t的值;如果不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526403436339200/2526506026500096/STEM/8d9525414bb04aa2b93a4db83c857d5f.png?resizew=275)
(1)AC= cm,BC= cm;
(2)设四边形MDEN的面积为y,求y的最大值;
(3)是否存在t的值,使得以M,E,N为顶点的三角形与△MDE相似?如果存在,求t的值;如果不存在,说明理由.
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