如图平行四边形ABCD,E,F分别是AD,BC上的点,且AE=CF,EF与AC交于点O.
(1)如图①.求证:OE=OF;
(2)如图②,将平行四边形ABCD(纸片沿直线EF折叠,点A落在A1处,点B落在点B1处,设FB交CD于点G.A1B分别交CD,DE于点H,P.请在折叠后的图形中找一条线段,使它与EP相等,并加以证明;
(3)如图③,若△ABO是等边三角形,AB=4,点F在BC边上,且BF=4.则
= (直接填结果).
(1)如图①.求证:OE=OF;
(2)如图②,将平行四边形ABCD(纸片沿直线EF折叠,点A落在A1处,点B落在点B1处,设FB交CD于点G.A1B分别交CD,DE于点H,P.请在折叠后的图形中找一条线段,使它与EP相等,并加以证明;
(3)如图③,若△ABO是等边三角形,AB=4,点F在BC边上,且BF=4.则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c8f776124750dbee7153b7bec7805f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ee5ae6fe-1c50-4d16-8e88-b10edab2d8ae.png?resizew=630)
更新时间:2020-08-19 15:48:48
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解答题-证明题
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困难
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名校
【推荐1】等腰
中,
,过点
作
于点
,平面上有一点
,连接
,
,
,作
的角平分线交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/1b70b27c-44c7-4154-acd2-d3035b6a6a0b.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/8cc4effd-3a1b-4a57-80dd-2c949c348f83.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/44094453-f959-49fa-acfa-c41c149f1156.png)
(1)图1,当
时,若
,
,求线段
的长;
(2)如图2,当
时,过点
作
,分别交
,
于点
,
,若
,
为
中点,连接
,求证:
;
(3)如图3,在(1)的条件下,
上取点
,
,点
,
为线段
上的两个动点(点
在点
的左侧),连接
,将
绕点
逆时针旋转得到
,若满足
于点
,连接
,
,当
的值最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/1b70b27c-44c7-4154-acd2-d3035b6a6a0b.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/8cc4effd-3a1b-4a57-80dd-2c949c348f83.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/44094453-f959-49fa-acfa-c41c149f1156.png)
(1)图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef95ebb3e3e81f72c609203f0a046a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fd76d8997e3b2db7d9cb9b72d0f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20602be3cee0c04ff9caec35cab0887c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce1335e489c2b0835d7e16ea765e1e9.png)
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(3)如图3,在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e4fca74089a2c6007f208d120823c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】(1)问题探究:如图①,在四边形ABCD中,AB∥CD,E是BC的中点,AE是∠BAD的平分线,则线段AB,AD,DC之间的等量关系为 ;
(2)方法迁移:如图②,在四边形ABCD中,AB∥CD,AF与DC的延长线交于点F,E是BC的中点,AE是∠BAF的平分线,试探究线段AB,AF,CF之间的等量关系,并证明你的结论;
(3)联想拓展:如图③,AB∥CF,E是BC的中点,点D在线段AE上,∠EDF=∠BAE,试探究线段AB,DF,CF之间的数量关系,并证明你的结论.
(2)方法迁移:如图②,在四边形ABCD中,AB∥CD,AF与DC的延长线交于点F,E是BC的中点,AE是∠BAF的平分线,试探究线段AB,AF,CF之间的等量关系,并证明你的结论;
(3)联想拓展:如图③,AB∥CF,E是BC的中点,点D在线段AE上,∠EDF=∠BAE,试探究线段AB,DF,CF之间的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/1/20/2380921619267584/2381400137859072/STEM/3e6fdcc2a8364ae383b7f2fb09d437ae.png?resizew=428)
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【推荐1】如图,直角坐标系中,A(2,0),点
在第一象限且
为正三角形,
的外接圆交y轴的正半轴于点
,过点
作圆的切线交x轴于点
.
![](https://img.xkw.com/dksih/QBM/2022/6/5/3001166193623040/3040887608713216/STEM/f2ddf97b8a23462aabc70ad95825fd03.png?resizew=192)
(1)求
、
两点的坐标;
(2)求直线
的函数解析式;
(3)设E、F分别是线段AB、AD上的两个动点,且EF平分四边形ABCD的周长,试求当△AEF的面积取最大值时AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://img.xkw.com/dksih/QBM/2022/6/5/3001166193623040/3040887608713216/STEM/f2ddf97b8a23462aabc70ad95825fd03.png?resizew=192)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)设E、F分别是线段AB、AD上的两个动点,且EF平分四边形ABCD的周长,试求当△AEF的面积取最大值时AE的长.
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【推荐2】操作发现:
如图1,△ABC为等边三角形,先将三角板中的60°角与∠ACB重合,再将三角板绕点C按顺时针方向旋转(旋转角大于0°且小于30°),旋转后三角板的一直角边与AB交于点D,在三角板斜边上取一点F,使CF=CD,线段AB上取点E,使∠DCE=30°,连接AF,EF.
(1)填空:①∠EAF的度数是 °;② ED与FE的数量关系是 .
类比探究:
(2)如图2,△ABC为等腰直角三角形,∠ACB=90°,先将三角板的90°角与∠ACB重合,再将三角板绕点C按顺时针方向旋转(旋转角大于0°小于45°),旋转后三角板的一直角边与AB交于点D,在三角板另一直角边上取一点F,使CF=CD,线段AB上取点E,使∠DCE=45°,连接AF,EF.
①求∠EAF的度数.
②请写出线段AE,ED,DB之间的关系,并证明所写结论的正确性.
如图1,△ABC为等边三角形,先将三角板中的60°角与∠ACB重合,再将三角板绕点C按顺时针方向旋转(旋转角大于0°且小于30°),旋转后三角板的一直角边与AB交于点D,在三角板斜边上取一点F,使CF=CD,线段AB上取点E,使∠DCE=30°,连接AF,EF.
(1)填空:①∠EAF的度数是 °;② ED与FE的数量关系是 .
类比探究:
(2)如图2,△ABC为等腰直角三角形,∠ACB=90°,先将三角板的90°角与∠ACB重合,再将三角板绕点C按顺时针方向旋转(旋转角大于0°小于45°),旋转后三角板的一直角边与AB交于点D,在三角板另一直角边上取一点F,使CF=CD,线段AB上取点E,使∠DCE=45°,连接AF,EF.
①求∠EAF的度数.
②请写出线段AE,ED,DB之间的关系,并证明所写结论的正确性.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/3024a10d-291e-4288-af3d-a46e267b8a54.png?resizew=410)
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【推荐1】如图1,在平面直角坐标系中,点A(0,6),点B是x轴正半轴上的一个动点,连接AB,取AB的中点M,将线段MB绕着点B按顺时针方向旋转90°,得到线段BC.过点B作x轴的垂线交直线AC于点D.设点B坐标是(2t,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/71d0d13b-2974-45b8-936e-e4f4d079eb58.png?resizew=195)
(1)当t=2时,点M的坐标是______.
(2)求点C的坐标(用含t的代数式表示).
(3)在点B的运动过程中,
①若四边形AOBD为矩形,求t的值;
②若△ABD为等腰三角形,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/71d0d13b-2974-45b8-936e-e4f4d079eb58.png?resizew=195)
(1)当t=2时,点M的坐标是______.
(2)求点C的坐标(用含t的代数式表示).
(3)在点B的运动过程中,
①若四边形AOBD为矩形,求t的值;
②若△ABD为等腰三角形,求t的值.
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【推荐2】如图1,直线
分别与
轴,
轴交于点
两点,
为线段
上的动点,点
关于直线
成轴对称,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/e0228dc2-85e0-43ea-b2ed-604fb184bbf0.png?resizew=563)
(1)求直线
的解析式.
(2)如图2,连结
并延长交
于点
,若
,求点
的坐标.
(3)如图3,点
是
的中点,连结
,当
与
中的一条边平行时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a5031b9958e7f4ef316a0a6f596937.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242f34ab3f00b22bc5dd11b04a911717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b499515419fa8a94aaf2753e32c3ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/e0228dc2-85e0-43ea-b2ed-604fb184bbf0.png?resizew=563)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f933d62599b66f39f51dd19ea84e3be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图3,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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1715eb5bb98c2f856c8979b04e1125c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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【推荐1】如图1,矩形ABCD的顶点A(6,0),B(0,8),AB=2BC,直线y=﹣
x+m(m≥13)交坐标轴于M,N两点,将矩形ABCD沿直线y=﹣
x+m(m≥13)翻折后得到矩形
.
(1)求点C的坐标和tan∠OMN的值;
(2)如图2,直线y=
x+m过点C,求证:四边形
是菱形;
(3)如图1,在直线y=
x+m(m≥13)平移的过程中.
①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85c632e08ce1b355808bc7a9ad9a051.png)
y轴;
②若矩形
的边与直线y=
+43有交点,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae2fd0bb6dcb90ee752e7bcabd22b8e.png)
(1)求点C的坐标和tan∠OMN的值;
(2)如图2,直线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f038ed3806ba59321c6086f66a5f40ed.png)
(3)如图1,在直线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85c632e08ce1b355808bc7a9ad9a051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
②若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae2fd0bb6dcb90ee752e7bcabd22b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be6f009bfb61b11e4f87edb4132de3e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/01c43a1f-bb03-4c90-ae5f-367a50c65cfb.png?resizew=474)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】将直角三角形纸片
放置在平面直角坐标系中,点
在
轴的正半轴上,点
,点
,
,点
在边
上(
不与点
,
重合),折叠该纸质,使折痕所在的直线经过点
,并与边
交于点
,且
,点
的对应点为点
.设
.
时,求
的大小和点
的坐标;
(2)如图②,若折叠后重合部分为四边形,
,
分别与
交于点
,
,试用含有
的式子表示
的长,并直接写出
的取值范围;
(3)请直接写出折叠后重合部分面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f751a17422fb04d7c55612b62b55f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0026fa26c9cd07146ae610db57f6fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d572eb3233343b90f190dde56701f22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.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/93729b00d0704ba4065eda75a9621619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce77e9b3018db01b344ee975dfa21d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图②,若折叠后重合部分为四边形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)请直接写出折叠后重合部分面积的最大值.
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