已知正方形
,点P在对角线
上,
交边
于E,连接
交
于Q点.
是等腰直角三角形.
(2)若
,
,求
的长.
(3)直接写出三条线段
,
,
之间的数量关系__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285df979daa278cbffa99f2381ee06b6.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe40405cd7bd60d69dd535d6da85c00.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f532e72b80c6f1389130066e323058e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b7ddeaf0a0ed481573cb15a7c79a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)直接写出三条线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
20-21八年级下·湖北武汉·阶段练习 查看更多[2]
湖北省武汉市七一中学2020-2021学年八年级下学期月考数学试题(已下线)专题15正方形的性质(六大题型)-【好题汇编】备战2023-2024学年八年级数学下学期期中真题分类汇编(人教版,湖北专用)
更新时间:2023-10-22 22:27:37
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相似题推荐
解答题-证明题
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名校
【推荐1】如图所示,在正方形
中,
,
分别为
,
的中点,
和
相交于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/137f7289-d19c-490e-a8c4-201601101130.png?resizew=436)
(1)如图
,试猜想
与
的数量关系和位置关系,请说明理由;
(2)求证:
;
(3)试猜想
、
与
之间的数量关系,并证明你的猜想.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/137f7289-d19c-490e-a8c4-201601101130.png?resizew=436)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4fb2e1f711d92daf9e32e669ded7d7d.png)
(3)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】如图,已知Rt△ABC,∠BAC=90°,在△ABC的外部分别以线段AB、AC、BC为边作正方形ABDE、正方形ACFG、正方形BCPQ,连接AQ、DC,交点为M.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/f58b37cc-f813-4f61-aee5-8c607194715b.png?resizew=486)
(1)判断线段AQ、DC的关系,并说明理由;
(2)如图①,过点A作AI⊥PQ,垂足为I,与边BC交于点H,证明:S矩形BHIQ=S正方形ABDE;
(3)直接写出S正方形ABDE,S正方形ACFG,S正方形BCPQ的数量关系;
(4)如图②,在Rt△ABC中,若∠ABC=45°,AC
,直接写出线段AQ的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/f58b37cc-f813-4f61-aee5-8c607194715b.png?resizew=486)
(1)判断线段AQ、DC的关系,并说明理由;
(2)如图①,过点A作AI⊥PQ,垂足为I,与边BC交于点H,证明:S矩形BHIQ=S正方形ABDE;
(3)直接写出S正方形ABDE,S正方形ACFG,S正方形BCPQ的数量关系;
(4)如图②,在Rt△ABC中,若∠ABC=45°,AC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae65bdb69940a67a18d56ff02060b22.png)
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【推荐1】在综合与实践课上,刘老师展示了一个情境,让同学们进行探究:
情境呈现:
如图1,等腰直角三角形
中,
,
,点P为
上一点,过点P作
,垂足为Q,连接
,点D为
的中点,连接
,
.
特殊分析:
绕点A顺时针旋转,当点P落在
上时,如图2,探究
与
的数量关系;
小明同学的分析如下:
填空:
①小明判断
的依据是______(填序号);
A.
B.
C.
D.
E.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
②请判断
的度数为______;
一般研讨:
(2)若将
绕点A在平面内顺时针旋转,如图3,
与
的数量关系是否发生变化?若变化,请说明理由;若不变化,请证明;
拓展延伸:
(3)若
,
,在
绕点A旋转的过程中,当
时,请直接写出线段
的长.
情境呈现:
如图1,等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
特殊分析:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.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/3525ddc5153fada64eaf14e50b536542.png)
小明同学的分析如下:
分别过点Q,C作![]() ![]() ∵ ![]() ![]() ![]() ![]() ∴ ![]() ![]() ![]() ∵点D是 ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
①小明判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d72e41a170758a2ef527a8b9174d690.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d885ccc243d7f2cebb47dcd77681ccd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4351a730f61bb998bab8f0b7848912d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
②请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b6edc361583a9fb853b5755a07cd2.png)
一般研讨:
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
拓展延伸:
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6758569a2f3b098253dedf7c575be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2202d9071a4a53bb61b1237269e537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79d42ca9316de7be10d095b5b9dc9748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb151bf3043b8a816660e9beb9e0c5b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
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解题方法
【推荐2】如图,在四边形ABCD中,AC⊥AD,∠ABC=∠ADC.在BC延长线上取点E,使得DC=DE.
(1)如图1,当AD∥BC时,求证:①∠ABC=∠DEC;②CE=2BC;
(2)如图2,若tan∠ABC=
,BE=10,设AB=x,BC=y,求y与x的函数表达式.
(1)如图1,当AD∥BC时,求证:①∠ABC=∠DEC;②CE=2BC;
(2)如图2,若tan∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/8808796c-9564-4852-a4c2-02b0ed90592b.png?resizew=538)
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真题
【推荐3】已知,如图,在平面直角坐标系中,点A坐标为(-2,0),点B坐标为 (0,2 ),点E为线段AB上的动点(点E不与点A,B重合),以E为顶点作∠OET=45°,射线ET交线段OB于点F,C为y轴正半轴上一点,且OC=AB,抛物线y=
x2+mx+n的图象经过A,C两点.
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/55978078e2664c2f9cd4be07088b4024.png)
(1) 求此抛物线的函数表达式;
(2) 求证:∠BEF=∠AOE;
(3) 当△EOF为等腰三角形时,求此时点E的坐标;
(4) 在(3)的条件下,当直线EF交x轴于点D,P为(1) 中抛物线上一动点,直线PE交x轴于点G,在直线EF上方的抛物线上是否存在一点P,使得△EPF的面积是△EDG面积的(
) 倍.若存在,请直接写出点P的坐标;若不存在,请说明理由.
温馨提示:考生可以根据题意,在备用图中补充图形,以便作答.
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/1e17276c9af54c9b8f14397261baf9b6.png)
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/55978078e2664c2f9cd4be07088b4024.png)
(1) 求此抛物线的函数表达式;
(2) 求证:∠BEF=∠AOE;
(3) 当△EOF为等腰三角形时,求此时点E的坐标;
(4) 在(3)的条件下,当直线EF交x轴于点D,P为(1) 中抛物线上一动点,直线PE交x轴于点G,在直线EF上方的抛物线上是否存在一点P,使得△EPF的面积是△EDG面积的(
![](https://img.xkw.com/dksih/QBM/2012/10/8/1573528817287168/1573528848687104/STEM/aca14b76715e4966a3ffd044db77726a.png)
温馨提示:考生可以根据题意,在备用图中补充图形,以便作答.
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【推荐1】如图示,以正方形
的点
为坐标原点建立平面直角坐标系,其中线段
在
轴上,线段
在
轴上,其中正方形
的周长为24.
(1)直接写出
,
两点的坐标.
(2)若与
轴重合的直线
以每秒1个单位长度的速度由
轴向右平移,移动至与
所在的直线重合时停止.在移动过程中直线
与
、
交点分别为点
和点
.问:运动多长时间时,长方形
的周长与长方形
的周长之比为5:4.
(3)在(2)的条件下,若直线
上有一点
,连接
、
,恰好满足
.求出
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e01068f79fe668989d793891867b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabb6fe6ebd897196aa96aaedf4dc35d.png)
(3)在(2)的条件下,若直线
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66e9eb7aa47a4f8d637aa9bf0259499.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/f7279893-0d25-4c45-9bfa-b7692d4e87bb.png?resizew=474)
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【推荐2】如图1,边长为
的正方形
的对角线相交于O,点E从B点出发,在
上以每秒2个单位的速度向D运动,同时点F从O点出发,在
上以每秒1个单位的速度向C运动,运动时间为t![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14476c101f30b40bf40bd8b2a51bdb90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/7e48e1bb-3891-4c4b-ac56-58822cc66bfe.jpg?resizew=396)
(1)当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7640fd6d3ae41080c15fcd40793a6b38.png)
(2)如图2,当
时,取
的中点M,连
、
,求证:
为定值
(3)如图3,取
的中点N,当F、E、N三点在同一条直线上时,求t的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec978eb43bc4f9e7df83b0d0195dcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14476c101f30b40bf40bd8b2a51bdb90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/7e48e1bb-3891-4c4b-ac56-58822cc66bfe.jpg?resizew=396)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7640fd6d3ae41080c15fcd40793a6b38.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56ba04145de9f760f274f5af8351eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91a7d1ed08859d42d994d804c8e6646.png)
(3)如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐3】【综合与实践】
课本64页安排这样的数学活动:折纸作
,
,
的角:如果我们身旁没有量角器或者三角尺,又需要做
,
,
等大小的角,可以采用下面的方法:
动手操作:如图1,(1)对折矩形纸片
,使
与
重合,得到折痕
,把纸片展开;(2)再一次折叠纸片,使点A落在
上,并使折痕经过点B,得到折叠
,同时得到线段BN.
观察猜想:图中等于
的角是:______(写出一个角即可);等于
的角是:______(写出一个角即可)
推理验证:任选以上一个猜想结论给予证明.
拓展延伸:将矩形纸片换成正方形纸片,按以上步骤折叠,并延长
交
于点Q,连接
得到图2,若
,直接写出
的长.
课本64页安排这样的数学活动:折纸作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
动手操作:如图1,(1)对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
观察猜想:图中等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
推理验证:任选以上一个猜想结论给予证明.
拓展延伸:将矩形纸片换成正方形纸片,按以上步骤折叠,并延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5c276923c1a46eaf18193604fdb6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/9ef52a7f-8e90-4074-8afe-f833ccc91f9d.png?resizew=364)
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名校
【推荐1】已知,如图1,BD是边长为1的正方形ABCD的对角线,BE平分∠DBC交DC于点E,延长BC到点F,使CF=CE,连接DF,交BE的延长线于点G.
(1)求证:△BCE≌△DCF;
(2)求CF的长;
(3)如图2,在AB上取一点H,且BH=CF,若以BC为x轴,AB为y轴建立直角坐标系,问在直线BD上是否存在点P,使得以B、H、P为顶点的三角形为等腰三角形?若存在,直接写出所有符合条件的P点坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/7574cc19-02c5-4820-bf8c-aa7073070531.png?resizew=361)
(1)求证:△BCE≌△DCF;
(2)求CF的长;
(3)如图2,在AB上取一点H,且BH=CF,若以BC为x轴,AB为y轴建立直角坐标系,问在直线BD上是否存在点P,使得以B、H、P为顶点的三角形为等腰三角形?若存在,直接写出所有符合条件的P点坐标;若不存在,说明理由.
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【推荐2】如图,正方形
的边长为
,射线
是
外角的平分线,点
在边
上运动(不与点
、
重合),点
在射线
上,且
,
与
相交于点
,连结
、
、
.
(1)求证:
;
(2)求
的周长(用含
的代数式表示);
(3)试探索:点
在边
上运动至什么位置时,
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22569e5010fe900eaefc4a025c774b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/8b07657f-cbb5-4961-842a-08b2dad35ad4.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0d6068866683547b733dbe005031a6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)试探索:点
![](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/b66eae532e1a1551cfc7b5ff9cfc5aa9.png)
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