如图,在
中,
,
,
是
内一点,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdfe85b2539c64ed6cc1cbf8d5cce42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/478e8c7d-ec05-4267-9632-05f55627dcf7.png?resizew=167)
更新时间:2024-02-08 16:06:01
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,以
为边作等腰
,其中
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ee8ef4f1-cea1-46b4-9054-e2344234587b.png?resizew=545)
(1)求证:
;
(2)作
的垂直平分线分别交
,
于点
,
.
①如图1,
,求证:
;
②如图2,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf82e97595128f030504932bd738e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ee8ef4f1-cea1-46b4-9054-e2344234587b.png?resizew=545)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d73bfafafc6b1418079f4f19ba55afd.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1212f222bed8b39156d13de8a35f40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2147ce587401c2434a80fcfae59713a2.png)
②如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbab4a3f9636fe3eeee75ba79d08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f223fda32883bf5b468f84c888ae8aa.png)
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解答题-作图题
|
较难
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【推荐2】如图是
的小正方形构成的网格,每个小正方形的顶点叫做格点.已知
,
,
,
仅用无刻度的直尺在给定网格中依次完成画图:
(1)画出线段
绕点B顺时针旋转
后得到的线段
;
(2)在线段
上找点F,使得点
;
(3)若线段
绕着点Q旋转到
,则旋转中心点Q的坐标______:
(4)连接
,作出点F关于线段
对称的点G.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb9d60d456560e9bac66c8b20c49bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f1f2b3e349a9be5fb156ae31525b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cba284d675a3028d7a8d54f1f8ae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f8edea2e5d4e08cf6210d0e9f3fdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97ce3dbfb099cdc378a2f004963668a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/df44abf1-2755-4b1e-b09e-d6ede10fe5be.png?resizew=145)
(1)画出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a4bbef957f179f55c28b37c64ce37.png)
(3)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐3】(1)阅读理解:如图1,在△ABC中,若AB=10,BC=8,求AC边上的中线BD的取值范围.小聪同学是这样思考的:延长BD至E,使DE=BD,连结CE.利用全等将边AB转化到CE,在△BCE中利用三角形三边关系即可求出中线BD的取值范围.在这个过程中小聪同学证三角形全等用到的判定方法是 ;中线BD的取值范围是 .
(2)问题解决:如图2,在△ABC中,点D是AC的中点,点M在AB边上,点N在BC边上,若DM⊥DN,求证:AM+CN>MN.
(3)问题拓展:如图3,在△ABC中,点D是AC的中点,分别以AB,BC为直角边向△ABC外作等腰直角三角形ABM和等腰直角三角形BCN,其中∠ABM=∠NBC=90°,连接MN,探索BD与MN的关系,并说明理由.
(2)问题解决:如图2,在△ABC中,点D是AC的中点,点M在AB边上,点N在BC边上,若DM⊥DN,求证:AM+CN>MN.
(3)问题拓展:如图3,在△ABC中,点D是AC的中点,分别以AB,BC为直角边向△ABC外作等腰直角三角形ABM和等腰直角三角形BCN,其中∠ABM=∠NBC=90°,连接MN,探索BD与MN的关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/a68ea367-d6b5-44ea-86f7-8508742b7978.png?resizew=488)
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【推荐1】已知,在
中,连接对角线
,
平分线
交
于点
,
平分线
交
于点
,
、
交于点
,点
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/9367bfeb-2d01-4756-aa27-f01a0460e09d.png?resizew=464)
(1)如图1,若
是等边三角形,
,求
的面积;
(2)如图2,若
是等腰直角三角形,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/444b25b1c1337c911a21d02934f03893.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/9367bfeb-2d01-4756-aa27-f01a0460e09d.png?resizew=464)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357d9412cb6b277a3e317d99135ab64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df2dbf3787bf957cd8be2a78fa71565.png)
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【推荐2】综合与实践
问题情境:
综合实践课上,老师让同学们以“三角形与四边形的相互转化”为主题展开数学活动.善思小组发现特殊三角形和特殊四边形之间可以相互转化解决问题,如矩形可以转化为两个直角三角形,菱形可以转化为两个等腰三角形等;而特殊三角形也可以转化为特殊四边形.他们通过探究提出“以等腰三角形为背景可以构造出平行四边形”,具体操作如下:如图1,在等腰三角形
中,
为
边上一点,过点B作
,且
,以点E为圆心,
长为半径画弧,交
的延长线于点F,连接
并延长,交
的延长线于点G,连接
.
(1)①图1中
与
的数量关系为___________;
②在不添加字母的条件下找出图1中的平行四边形,并说明理由.
(2)如图1,试猜想
与
的位置关系,并给出证明.
拓展应用:
(3)如图2,在等腰三角形
中,其他条件不变,若射线
恰好经过
的中点O,且
,
,请直接写出
的长.
问题情境:
综合实践课上,老师让同学们以“三角形与四边形的相互转化”为主题展开数学活动.善思小组发现特殊三角形和特殊四边形之间可以相互转化解决问题,如矩形可以转化为两个直角三角形,菱形可以转化为两个等腰三角形等;而特殊三角形也可以转化为特殊四边形.他们通过探究提出“以等腰三角形为背景可以构造出平行四边形”,具体操作如下:如图1,在等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2586d7ae15fc7878ab150b2fac31e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e13b42697687260bda1028221c9fbbe.png)
(1)①图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②在不添加字母的条件下找出图1中的平行四边形,并说明理由.
(2)如图1,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
拓展应用:
(3)如图2,在等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0ae8b73d3da30c91848d9a473a7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2775c661875e302b80216a4fd257db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐1】(1)如图1,在等边三角形
中,点D、E分别在边
、边
上,
,连接
与
相交于点G,求
的度数;
(2)如图2,在等边三角形
中,点D、E分别在边
、边
的延长线上,
,
与
延长线相交于点G,若
,
,试证
的度数是否发生变化,并求
的长;
(3)如图3,在
中,
,
,点D,E分别为
上的动点,且
,
.求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38c210b4c9dcec1b6a036900c97fa28.png)
(2)如图2,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55269b815a50c204cf9d847ac69f1ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754accc36bf770d3bf07e539ec9d0258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38c210b4c9dcec1b6a036900c97fa28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.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/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2663efe783fb96d5dc92c05ca7593caa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/1033bb8d-3513-4eee-99a9-0465bd8577fe.png?resizew=504)
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【推荐2】【问题情境】同学们探究“全等的等腰直角三角形图形变化问题”
如图1,
,其中
,此时,点
与点
重合.
【操作探究】(1)小明将图1中的两个全等的
和
按图2方式摆放,点
落在
上,
所在直线交
所在直线于点
,连结
,直接写出线段
与线段
的数量关系是 .
【拓展应用】(2)小亮将图1中的
绕点
按顺时针方向旋转角度
,线段
和
相交于点
,在操作中,小亮提出如下问题,请你解答:
①如图3,当
时,直接写出线段
的长为 ;
②如图4,当旋转到点
是边
的中点时,求线段
的长.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03a43549ab71f0998fffbcb48397b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d517994729fe7b892e1fbdfdfabd2712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
【操作探究】(1)小明将图1中的两个全等的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
【拓展应用】(2)小亮将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7199ded47c047792b3147c25467359c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②如图4,当旋转到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,已知
的内角
的平分线
与它的一个外角
的平分线
所在的直线交于点
.
(1)求证:
;
(2)若作点
关于
所在直线的对称点
,并连接
、
.
①如图2,当
时,求证:
;
②如图3,当
时,试探究
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/9/97b4eb6c-eab7-4e13-b948-fe226b8010c5.png?resizew=451)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59f5c3923354587bf3b08d0538af208.png)
(2)若作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfc5a72f681a19371b86ed2afcc7ffd.png)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ccb9bf185db4e175cf983877356d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图①,在△ABD中;∠A=60°,AD=2AB=4cm,将△ABD绕BD中点O旋转180°得到△CDB,点E是AD的中点,点P从点A出发,沿折线A→B→C以1cm/s的速度向终点C运动,连接PE,设运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8c48f4e0-98f7-4737-ad8d-9492a12765b3.png?resizew=475)
(1)BC= ;
(2)用含有t的代数式表示PB的长;
(3)当PE将四边形ABCD的周长分成2∶3两部分时,求t的值;
(4)如图②.在点P运动过程中,作点A关于直线PE的对称点
,连接
.当
所在直线与四边形ABCD的边垂直时,请直接写出∠AEP的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8c48f4e0-98f7-4737-ad8d-9492a12765b3.png?resizew=475)
(1)BC= ;
(2)用含有t的代数式表示PB的长;
(3)当PE将四边形ABCD的周长分成2∶3两部分时,求t的值;
(4)如图②.在点P运动过程中,作点A关于直线PE的对称点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f02f0a90d3a34d0bf56ff9651c05af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f02f0a90d3a34d0bf56ff9651c05af0.png)
您最近一年使用:0次