综合与实践
(1)如图1,正方形
的对角线相交于点
,点
又是正方形
的一个顶点,而且这两个正方形的边长都为1,四边形
为两个正方形重叠部分.正方形
可绕点
转动.则下列结论正确的是_________(填序号即可).
①
;②
;③四边形
的面积总等于
;④连接
,总有
.
(2)如图2,矩形
的对角线
中点
是矩形
的一个顶点,
与边
相文于点
与边
相交于点
,连接
,矩形
可绕着点
旋转.
①猜想
之间的数量关系,并进行证明;
②直接写出线段
之间的数量关系为_________.
(3)如图3,在
中,
,直角
的顶点
在边
的中点处,它的两条边
和
分别与直线
相交于点
可绕着点
旋转,当
时,线段
的长度为_________
.
(1)如图1,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0463da43878c8c9848d921ecf77f1ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0f79142caacc4d08942ffa23511f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0463da43878c8c9848d921ecf77f1ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd10cbfc3eb507486caa6ab126f92b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e80a8bd94cda556ea7444f187a670a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/7aca8491-6f3b-4084-aa9e-413424efa305.png?resizew=254)
(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc526324e78e4d9226d1b537f27845a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d83d6bef3863e008fd27c52b9422e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e045bc50398f2a1196c67a83a1b00b5.png)
②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0665089d1c423ae3ece93fa31ccb1451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/42308180-f148-4ec1-8d52-858cfae8bf4d.png?resizew=282)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8807117d0d649419fdda04c531cdc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d82675b28bf04a069c442ca4f0c18b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0512238dc25537ecef76e221e89382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4f3ab11a8b54cf29685b1f750cb130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/ece88b86-5aca-4bef-9418-bfb00077c568.png?resizew=185)
更新时间:2023-07-11 10:07:17
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在
中,
,
,点
在直线
上,点
在直线
上,连接
、
,且
,直线
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/20bf0109-cee7-4bc8-bae6-6f9590931485.png?resizew=469)
(1)如图1,当点
在线段
上时,
,
,求BE的长;
(2)如图2,当点
是
的中点时,求证:
;
(3)如图3,连接
,将
沿着
翻折,得到
,点
是
上一点,且
,当
最短时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/20bf0109-cee7-4bc8-bae6-6f9590931485.png?resizew=469)
(1)如图1,当点
![](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/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
(2)如图2,当点
![](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/e02b9554e2e8515bb14eb863e48c9cfe.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172f1b400d9ddec4ea01f6fd040b3802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085e70c258727bd4461e4535b218c2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42198b8e646ccfbbec323fd364c4d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef7d8f1ce495aa3b9045a0deab7e808.png)
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【推荐2】如图1,在四边形ABCD中,
,点E在边BC上,且
,
,作
交线段AE于点F,连接BF.
(1)求证:
;
(2)如图2.若
,
,
,求BE的长;
(3)如图3,若BF的延长线经过AD的中点M,则
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f90318c1a8d868d69fba0e8ab960bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8256dc97e0101783f83159d35eeadf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137c721b8d4ea6dca8b7d9761134726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6674cf08c17655ec16e5a8ae67f656e8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a47c77ec80e408fb5bbf8da7d80451.png)
(2)如图2.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9392842583ac2a72a9385a7ee6886096.png)
(3)如图3,若BF的延长线经过AD的中点M,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915a3686bd9b0e04223907bf56e89ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/2ea08b49-46e5-4ee5-b740-405ac56378a0.png?resizew=392)
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解答题-问答题
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较难
(0.4)
名校
【推荐1】如图,等腰三角形
的腰长
,
,动点
从
出发沿
向
运动,速度为
,动点
从
出发沿
向
运动,速度为
,当一个点到达终点时两个点同时停止运动.点
是点
关于直线
的对称点,连接
和
,
和
相交于点
.设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/3346f721-68fd-48f7-9891-1d26fc1bf8fc.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/f212a9bf-3f49-4a99-bec7-ac682f882aa9.png?resizew=239)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/96550635-18bc-459e-924d-5df89a94f8fc.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/bd172b97-db47-4b27-bc31-c646a756bb4f.png?resizew=241)
(1)若当
的值是多少时,
恰好经过点
?
(2)设
的面积为
,求
与
之间的函数关系式
.
(3)是否存在某一时刻
,使
平分
?若存在,求出相应的
值,若不存在,请说明理由.
(4)是否存在某一时刻
,使点
在
的垂直平分线上?若存在,求出相应的
值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bbc68f2a65aea126b6e0d2c1081037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4052e0adb82d6f9db13bd1b3de5bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4ca80c5dcdc6c8e3c5065462a9a2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4052e0adb82d6f9db13bd1b3de5bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/3346f721-68fd-48f7-9891-1d26fc1bf8fc.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/f212a9bf-3f49-4a99-bec7-ac682f882aa9.png?resizew=239)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/96550635-18bc-459e-924d-5df89a94f8fc.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2021/8/10/2782886644203520/2816969889628160/STEM/bd172b97-db47-4b27-bc31-c646a756bb4f.png?resizew=241)
(1)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4052e0adb82d6f9db13bd1b3de5bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe102d7b5f9100bd04456757a75c259.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c67a2e855fd0770b612ae91f87d5da5.png)
(3)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c1001e41d66bdd8607cb47419c3cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
|
较难
(0.4)
【推荐2】下面是小明同学设计的“已知底边及底边上的中线作等腰三角形”的尺规作图过程.
已知:如图1,线段a和线段b
求作:△ABC,使得AB=AC,BC=a,BC边上的中线为b
作法:如图2
①作射线BM,并在射线BM上截取BC=a
②作线段BC的垂直平分线PQ,PQ交BC于D
③以D为圆心,b为半径作弧,交PQ于A
④连接AB和AC
则△ABC为所求作的图形
根据上述作图过程,回答问题:
(2)完成下面的证明:
证明:由作图可知BC=a,AD=b.
∵PQ为线段BC的垂直平分线,点A在PQ上,
∴AB=AC(___ )(填依据)
又∵线段BC的垂直平分线PQ交BC于D
∴BD=CD(___ )(填依据)
∴AD为BC边上的中线,且AD=b
已知:如图1,线段a和线段b
求作:△ABC,使得AB=AC,BC=a,BC边上的中线为b
作法:如图2
①作射线BM,并在射线BM上截取BC=a
②作线段BC的垂直平分线PQ,PQ交BC于D
③以D为圆心,b为半径作弧,交PQ于A
④连接AB和AC
则△ABC为所求作的图形
根据上述作图过程,回答问题:
(2)完成下面的证明:
证明:由作图可知BC=a,AD=b.
∵PQ为线段BC的垂直平分线,点A在PQ上,
∴AB=AC(___ )(填依据)
又∵线段BC的垂直平分线PQ交BC于D
∴BD=CD(___ )(填依据)
∴AD为BC边上的中线,且AD=b
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【推荐1】如图1,正方形
中,
,
是
边的中点,点
是正方形内一动点,
,连接
,过点
在
的右侧作
,且
,连接
、
.
;
(2)当
时,求
的长;
(3)如图2,若
三点共线,求点
到直线
的距离;
(4)直接写出线段
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af9774200946261f0ccba3e6eeba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.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/3c9f501137809dba21dfab7dd56f68f7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01bf1398c93b6f14c016cf4ccc39b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89585c18e76317e295b877c25bfef451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(4)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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【推荐2】已知平行四边形
,E为
边上的中点,F为
边上的一点,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/427e9ab8-0a7d-4fd0-9a78-677974cb1623.png?resizew=497)
(1)如图1,连接
并延长交
的延长线于点G,求证:
;
(2)如图2,若
,
,求
;
(3)如图3,若
,P为
的中点,Q为
的中点,
,
,
①判断
与
的位置关系,并说明理由;
②求
.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/427e9ab8-0a7d-4fd0-9a78-677974cb1623.png?resizew=497)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4763d25d89038fd620543cebeb9b630b.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e195e21a4520c4ce130785171af56d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048982728a2204a2f78c3f186af4c07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cad196e55dbd13c45e11a51d700383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8adbc96bd4697ace4d9a318db350c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f403d7982e80e4b0a306e64e7e72fa0.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解题方法
【推荐1】[问题发现]
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/6dce417a-9769-4094-8a7e-ef57afd3709c.png?resizew=355)
(1)如图1,在Rt△ABC中,
,
,点
为
的中点,以
为一边作正方形
,点
与点
重合,已知
.请直接写出线段
与
的数量关系;
[实验研究]
(2)在(1)的条件下,将正方形
绕点
旋转至如图2所示的位置,连接
,
,
.请猜想线段
和
的数量关系,并证明你的结论;
[结论运用]
(3)在(1)(2)的条件下,若
的面积为8,当正方形
旋转到
,
,
三点共线时,请求出线段
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/6dce417a-9769-4094-8a7e-ef57afd3709c.png?resizew=355)
(1)如图1,在Rt△ABC中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab884846c94cd7c4f1b516a3ffd64756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
[实验研究]
(2)在(1)的条件下,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
[结论运用]
(3)在(1)(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/6aa2b5e09f8ec785c59900a529390a02.png)
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解题方法
【推荐2】已知四边形ABCD是正方形,一个等腰直角三角板的一个锐角顶点与A点重合,将此三角板绕A点旋转时,两边分别交直线BC,CD于M,N.
(1)如图1,当M,N分别在边BC,CD上时,求证:BM+DN=MN
(2)如图2,当M,N分别在边BC,CD的延长线上时,请直接写出线段BM,DN,MN之间的数量关系
(3)如图3,直线AN与BC交于P点,MN=10,CN=6,MC=8,求CP的长.
(1)如图1,当M,N分别在边BC,CD上时,求证:BM+DN=MN
(2)如图2,当M,N分别在边BC,CD的延长线上时,请直接写出线段BM,DN,MN之间的数量关系
(3)如图3,直线AN与BC交于P点,MN=10,CN=6,MC=8,求CP的长.
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名校
【推荐3】(一)问题情境:如图1,已知点E,F分别在正方形
的边
,
上,且
,点M为
的中点,连接
,
.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828686886699008/2829668395728896/STEM/dce4bde7-e2ba-432b-ad2e-56f46edbf517.png)
(1)线段
与
之间的数量关系是________,位置关系是________.
(二)猜想证明:
(2)如图2,将线段
和
绕点B逆时针旋转,旋转角均为
(
).点M为线段
的中点,连接
,请你判断(1)中的两个结论是否仍然成立.若成立,请证明;若不成立,请说明理由.
(三)探索发现:
(3)将图1中的线段
和
绕点B逆时针旋转,旋转角为
,点M为线段
的中点,得到如图3所示的图形,请你判断线段
与
之间的数量关系是否发生变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828686886699008/2829668395728896/STEM/dce4bde7-e2ba-432b-ad2e-56f46edbf517.png)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
(二)猜想证明:
(2)如图2,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
(三)探索发现:
(3)将图1中的线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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