如图,四边形ABCD中,∠BAD=∠C=90°,AB=AD,AE⊥BC,垂足为E,AE=3,求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869384594464768/2870786135113728/STEM/6d4a2b23-25b3-4560-aa84-b0870f99446f.png?resizew=153)
更新时间:2021-12-12 09:32:15
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在平面直角坐标系中,点
、
分别在
、
轴上,已知点
的坐标为
,且
.
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/f5afb2f23f32445c8a0710ff183fa821.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/195c431625d64f9b8aec56908f672f4a.png?resizew=139)
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/e82603b75e394089909005624308809d.png?resizew=143)
(1)求
的长度;
(2)以
为一边作等边,过点
作
,交
的垂直平分线
于点
.求证:
;
(3)在(2)的条件下,连接
交
于
,求证:
为
的中点.
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f60531dc319321b409b34297494542.png)
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/f5afb2f23f32445c8a0710ff183fa821.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/195c431625d64f9b8aec56908f672f4a.png?resizew=139)
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217536905216/2272351477538816/STEM/e82603b75e394089909005624308809d.png?resizew=143)
(1) (2) (3)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)以
![](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/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd164bdd9176f6b6fcd059159cfd65a.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,矩形
中,
,
,E是边
上一点,将
沿直线
对折,得到
.连接
.
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394075942920192/2394397247963136/STEM/84609ab5b39c41f9ac4d245c223246e3.png?resizew=130)
(1)当D、E、F三点共线时,证明:
;
(2)当
时,求
的面积;
(3)若射线
交线段
于点P,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671816423946863f9201c256112bcee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4643ee6debb99d9a9d00eb83ee1aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394075942920192/2394397247963136/STEM/84609ab5b39c41f9ac4d245c223246e3.png?resizew=130)
(1)当D、E、F三点共线时,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
(3)若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐1】(1)已知
是关于
的一元二次方程
的一个根,求
的值和方程的另一个根;
(2)如图,在矩形ABCD中.点O在边AB上,∠AOC=∠BOD,求证:AO=OB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754a5a4102094d0fc8a8c16c4fcd9bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d729efa44ee74ffe0662d2c3723a5937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)如图,在矩形ABCD中.点O在边AB上,∠AOC=∠BOD,求证:AO=OB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/4aab7e04-1447-4e09-9085-82c49c46a928.png?resizew=163)
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名校
【推荐2】如图所示,已知:在
中,
,
,
是边
上的中线,点
是直线
上任意一点,
,交直线
于点
.点
是
中点,延长
交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153217426014208/3155653147639808/STEM/d0bdb465d7154c0993cebdeb41ea90b3.png?resizew=267)
(1)若点
在边
上,
①证明:
;
②证明:
;
(2)若
,
,直接写出边
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9d78abbad68bbbf12af10cd40ef4c353.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/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153217426014208/3155653147639808/STEM/d0bdb465d7154c0993cebdeb41ea90b3.png?resizew=267)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9ddaa7097afa02e91d4de2cb50718e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aff006f6a11a47638279c09d67d45ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】某数学研学小组将完成测量古塔大门上方匾额高度的任务,如图1是悬挂巨大匾额的古塔,如图
,线段
是悬挂在墙壁
上的匾额的截面示意图.已知
米,
,起始点
处看点
,仰角
,继续向前行走,在点
处看点
,仰角
.且
到
走了
米,作
.(
,
,
,
,
,
)
;
.
(2)求匾额下端距离地面的高度
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b5e86e15058757b1eb106d1e9faa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60573a0c890e970891dc3715b5984ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac5574b76a4b2342d80916aeabbf766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99f66e0f98e629192ca6a47c72dd292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d687ac9dee0ac1d25da5dc9f838ef9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5393273eaa54e89959bd5f5e5a40d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04be3a364589bb19949134cb5fc6fe3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76bad0eb4e3f63d9a34847e44f05256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c96ff097fbef257cfce96bf63144be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c76980892459727b5a2a75771f6482e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8405f92778a8b1259d57a59310db2025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269700e01ddb54a6464aa13404f52729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86e60622e9acce8026765cdbf775ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ccc69b707719f627d434f9052037ae.png)
(2)求匾额下端距离地面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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解答题-证明题
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【推荐2】已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025279373312/2540868548739072/STEM/f47f8daa-7252-43fc-a4d2-c1d05f95fe80.png)
(1)如图1,求证:四边形
为矩形.
(2)如图2,
是
边的中点,
为
边上的一点,
,求证:
.
(3)如图3,在(2)的条件下,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025279373312/2540868548739072/STEM/f47f8daa-7252-43fc-a4d2-c1d05f95fe80.png)
(1)如图1,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabd660ff9eed83c543bd61750388f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee86f875478d9c166073632fb9635d9b.png)
(3)如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4982bdbeb295651557a71800f567444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-问答题
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(0.65)
名校
【推荐3】2022版《数学课程标准》指明推理能力是指从一些事实和命题出发,依据规则推出其他命题或结论的能力,目前我们已经具备应用已学知识证明其他结论的能力.请阅读下列材料,完成相应任务.
【方法解析】
【数学思想】
(2)上述证明方法中主要体现的数学思想是________;
A.转化思想 B.类比思想 C.数形结合思想 D.从一般到特殊思想
【知识迁移】
(3)如图3,点
是线段
上一点,
,点
是线段上一点,分别连接
,
点
,
分别是
和
的中点,连接
.若
,
,
,请求
的长.
【方法解析】
求证:“直角三角形斜边上的中线等于斜边的一半” 如图1, ![]() ![]() ![]() ![]() ![]() 分析:要证明 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
【数学思想】
(2)上述证明方法中主要体现的数学思想是________;
A.转化思想 B.类比思想 C.数形结合思想 D.从一般到特殊思想
【知识迁移】
(3)如图3,点
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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