如图1,已知菱形
的边长为6,
,点E、F分别是边
,
上的动点(不与端点重合),且
.
(1)求证:
.
(2)当点E在什么位置时,
的面积最大,并求出此时面积的最大值.
(3)如图2,连接
分别与边
、
交于
、
,当
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.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/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/2bbf6e28-5f9a-4caa-974e-648b34ceceb1.png?resizew=610)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)当点E在什么位置时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/6c3c13d921d69e148a91ff7a46f657ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f416a19e6bc5baccd6154daced967a3.png)
更新时间:2023-06-29 21:52:28
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】我们可以通过类比联想,引申拓展研究典型题目,可达到解一题知一类的目的,下面是一个案例,请补充完整.
原题:如图1,点E、F分别在正方形
的边
上,
,连接
,则
,试说明理由.
∵
,
∴把
绕点A逆时针旋转
至
,可使
与
重合.
∵
,
∴
,点F、D、G共线.
根据 ,易证
,得
.
(2)类比引申
如图2,四边形
中,
,
,点E、F分别在边
上,
.若
都不是直角,则当
与
满足等量关系 时,仍有
.
(3)联想拓展
如图3,在
中,
,
,点D、E均在边BC上,且
.猜想
应满足的等量关系,并写出推理过程.
原题:如图1,点E、F分别在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
∴把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd6f0a0412d0f43ce1f7c1d530e56e.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/1a4d67cda359da23b9879419ee4c60e4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b786297e18a79a55cfb976a1435ec7.png)
根据 ,易证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a7fb653a6042300b7fc56f759fa34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
(2)类比引申
如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5b8de60ccfc78eb7707d1e22ca0de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
(3)联想拓展
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc6c2fb98c91585d0b97eb04597849d.png)
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【推荐2】在平面直角坐标系中,O为坐标原点,A,D两点坐标分别为A(0,a),D(b,b),且a﹣b=
.
(1)求A,D两点坐标;
(2)点B,C是x轴上两动点(B在C左侧),且使四边形ABCD为平行四边形.
①如图,当点B,C分别在原点两侧时,连接DO,过点O作OG⊥DO交AB于点G,连接DG,取DG中点H,在DO上截取DE,使DE=GO,求证:4AH2+DE2=2AE2;
②当点B在原点左侧时,过点O的直线MN⊥AB,分别交AB,CD于M,N,试探究OM,BM,CN三条线段之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715705648783360/2781594213933056/STEM/ce26076f-ec59-4da0-a22c-f5a7508465ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1ec56a2a605a8bc1a4881c02668440.png)
(1)求A,D两点坐标;
(2)点B,C是x轴上两动点(B在C左侧),且使四边形ABCD为平行四边形.
①如图,当点B,C分别在原点两侧时,连接DO,过点O作OG⊥DO交AB于点G,连接DG,取DG中点H,在DO上截取DE,使DE=GO,求证:4AH2+DE2=2AE2;
②当点B在原点左侧时,过点O的直线MN⊥AB,分别交AB,CD于M,N,试探究OM,BM,CN三条线段之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715705648783360/2781594213933056/STEM/ce26076f-ec59-4da0-a22c-f5a7508465ed.png)
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715705648783360/2781594213933056/STEM/5c9bc628-d84e-464d-9ea3-73f6ebcf769e.png)
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解答题-证明题
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名校
【推荐3】某研究性学习小组在探究矩形的折纸问题时,将一块直角三角板的直角顶点绕矩形ABCD(AB<BC)的对角线的交点O旋转(①⇒②⇒③),图中的M、N分别为直角三角形的直角边与矩形ABCD的边CD、BC的交点.
(1)该学习小组成员意外的发现图①(三角板一直角边与OD重合)中,BN2=CD2+CN2,在图③中(三角板一边与OC重合),CN2=BN2+CD2,请你对这名成员在图①和图③中发现的结论选择其一说明理由.
(2)试探究图②中BN、CN、CM、DM这四条线段之间的数量关系,写出你的结论,并说明理由.
(3)将矩形ABCD改为边长为1的正方形ABCD,直角三角板的直角顶点绕O点旋转到图④,两直角边与AB、BC分别交于M、N,直接写出BN、CN、CM、DM这四条线段之间所满足的数量关系.(不需要证明)
![](https://img.xkw.com/dksih/QBM/2019/5/13/2202825838592000/2205502818705408/STEM/6cae1a61f6a4457991b7133a930abfa4.png?resizew=359)
(1)该学习小组成员意外的发现图①(三角板一直角边与OD重合)中,BN2=CD2+CN2,在图③中(三角板一边与OC重合),CN2=BN2+CD2,请你对这名成员在图①和图③中发现的结论选择其一说明理由.
(2)试探究图②中BN、CN、CM、DM这四条线段之间的数量关系,写出你的结论,并说明理由.
(3)将矩形ABCD改为边长为1的正方形ABCD,直角三角板的直角顶点绕O点旋转到图④,两直角边与AB、BC分别交于M、N,直接写出BN、CN、CM、DM这四条线段之间所满足的数量关系.(不需要证明)
![](https://img.xkw.com/dksih/QBM/2019/5/13/2202825838592000/2205502818705408/STEM/6cae1a61f6a4457991b7133a930abfa4.png?resizew=359)
![](https://img.xkw.com/dksih/QBM/2019/5/13/2202825838592000/2205502818705408/STEM/77330cad27c94433995a2507fd4025a4.png?resizew=141)
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解答题-证明题
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【推荐1】如图,菱形
,
.
,则菱形
的面积为 ;
(2)点E、F分别为菱形
边
、
上一个动点,连接
、
,且
、
交于点P,
、
交于点G,E、F在运动过程中,三角形
的面积与四边形
的面积相等.
①如图2,求证:
;
②如图3,O为
的中点,连接
、
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)点E、F分别为菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e106f4233be16e98f2c1bf9f1635622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1e5ffab8df4dbe139ffedf691b2346.png)
①如图2,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b832a541b0c06d650c0cd10b176226.png)
②如图3,O为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8759d4799d2daa7f46203b701ec2b5.png)
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解答题-问答题
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名校
【推荐2】如图1,在菱形
中,对角线
、
相交于点
,顶点
、
在反比例函数
的图像上,点
在反比例函数
的图像上,
轴.
,
,则菱形
的面积为______;
(2)①当点
、
在坐标轴上时,求
的值.
②如图2,当点
、
、
三点在同一直线上时,试判断
是否为定值.若是,求出该定值;若不是,说明理由.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b64b055d32519390aa46114fa65ca4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a7434e36ed40a7c1ec5169095e7436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2241bd71e0c20867029e489f9ba655d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2fa70d77c4d066b602e843e80bbba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7878f57ca07692f6295d5fbb1067f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a3f348a942d468f0d77c0dfbb41d87.png)
②如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a3f348a942d468f0d77c0dfbb41d87.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐1】如图,在菱形
中,
,
在
边上,
在
的延长线,
,射线
交
于
,连接
.
(1)如图,当点
是
中点,线段
,
,
的数量关系是________;
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712389393973248/2721598281613312/STEM/663a09ad-7079-4bfc-84b4-5740eb14cb9e.png)
(2)如图,当点
不是
中点,(1)的结论是否成立?若成立,请写出证明过程;若不成立,请说明理由;
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712389393973248/2721598281613312/STEM/398f805a-a159-472d-9d26-acb757606613.png)
(3)若
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378ab247cf28dd1b17d48a508fa92176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
(1)如图,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712389393973248/2721598281613312/STEM/663a09ad-7079-4bfc-84b4-5740eb14cb9e.png)
(2)如图,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712389393973248/2721598281613312/STEM/398f805a-a159-472d-9d26-acb757606613.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49954888d029e06d94e7b6b03f1ff09f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
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【推荐2】[情景引入]如图1,射线AD与线段AB重合,将射线AD绕点A逆时针方向旋转旋转角为
,
,在旋转过程中,某一时刻射线AD把
分成面积相等两部分,于是我们可以求得
,此时我们把射线AD称为
的“完美分割线”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/104ebaeb-a3e3-4c87-87e7-a73d0b5a8fa3.png?resizew=522)
[理解应用]
如图2,在钝角
中,点E是线段BC的中点,试说明:射线AD是
的“完美分割线”.
[问题提升]
在菱形ABCD中,
,点O为射线CA上的动点,作射线OM与直线BC相交于点E,将射线OM绕点O逆时针旋转60°,得到射线ON,射线ON与直线CD相交于点F.
(1)如图3,点O与点A重合时,点E,F分别在线段BC,CD上,
①请直接写出CE,CF,CA三条段段之间的数量关系;
②连接E、F,试说明:
为等边三角形.
(2)如图4,将
绕点O以每秒2°的速度逆时针方向旋转,当OM与AD重合时停止运动(旋转时间为t);试问:当t为何值时,射线OM或射线ON是某个三角形的“完美分割线”?(注:解答时原图不添加任何字母和辅助线)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ba64fde103dbb04c4dbfdd2e05c57f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b40507904e06298fa368537f93420b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/104ebaeb-a3e3-4c87-87e7-a73d0b5a8fa3.png?resizew=522)
[理解应用]
如图2,在钝角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
[问题提升]
在菱形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
(1)如图3,点O与点A重合时,点E,F分别在线段BC,CD上,
①请直接写出CE,CF,CA三条段段之间的数量关系;
②连接E、F,试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(2)如图4,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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【推荐1】在
,
,
,
,将
绕着点
顺时针旋转
得到
.
(1)如图1,当点
落在
边上时,旋转角
__________
.
(2)如图2,当点
与
在同一条直线上时,求点
,
之间的距离.
(3)如图3,当点
落在
边上时,
,
分别是
,
的中点,求
的长度.
![](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/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/ceb2bf57-fe1c-4126-ad65-ab86051260f9.png?resizew=540)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】△ABC是等边三角形,P为其内的一点,并且满足PA=25,PB=7,PC=24,试求∠CPB的度数?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/54cc0c79-4fdc-4952-ad47-1d01153535ca.png?resizew=167)
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【推荐3】(1)问题提出:如图①,已知正方形ABCD的边长为4,E是BC的中点,将线段AE绕点E顺时针旋转90°得到线段FE,连接CF,求CF的长;
(2)问题解决:为了解乡村生活、体验乡村水土风情、享受田园风光,某校计划利用空地修建蔬菜种植基地,让学生自己种植,自己管理,学习种植技术,体验丰收的喜悦.已知蔬菜种植基地ABCD的设计示意图如图②所示,其中AD∥BC,BC=CD=100m,∠C=60°,E为CD上一点,且不与C,D重合,∠AEB=60°.按设计要求,△ABE中种植叶菜类,其余种植根茎类.设CE的长为x(m),蔬菜种植基地的面积为y(m2).
①求y与x之间的函数关系式;
②当种植叶菜类的面积恰好与根茎类的面积相等时,求AB的长.
(2)问题解决:为了解乡村生活、体验乡村水土风情、享受田园风光,某校计划利用空地修建蔬菜种植基地,让学生自己种植,自己管理,学习种植技术,体验丰收的喜悦.已知蔬菜种植基地ABCD的设计示意图如图②所示,其中AD∥BC,BC=CD=100m,∠C=60°,E为CD上一点,且不与C,D重合,∠AEB=60°.按设计要求,△ABE中种植叶菜类,其余种植根茎类.设CE的长为x(m),蔬菜种植基地的面积为y(m2).
①求y与x之间的函数关系式;
②当种植叶菜类的面积恰好与根茎类的面积相等时,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/3ba376d5-7e1b-4d5f-9730-aeba68bb2eec.png?resizew=341)
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