如图(1),正方形
中,P为边
上的一个动点,作等腰直角
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/c6a51abf-2b79-4cf3-96e9-6dd934ba8a17.png?resizew=380)
(1)在点P的运动过程中,点E的运动是有规律的,试说明点E运动的方向路线,并证明你的结论;
(2)若
交
于点F,连接
,小红在研究这个图形时,经过思考,发现这道题目里面包含有一个什么角模型,请你在她的基础上,证明
;
(3)如图(2),连接
,H为
的中点,连接
,若
的长是方程
的一个实数根,求线段
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82db69724caf36cda24cdc85facfd7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35568ebb2bf213b65fa4e4eef284a930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/c6a51abf-2b79-4cf3-96e9-6dd934ba8a17.png?resizew=380)
(1)在点P的运动过程中,点E的运动是有规律的,试说明点E运动的方向路线,并证明你的结论;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa9a479b225436433b1102d58bf168e.png)
(3)如图(2),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fab249d9d2a4605d920169fb01814a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
更新时间:2022-10-22 10:25:42
|
相似题推荐
解答题-问答题
|
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名校
【推荐1】已知方程①:
为关于x的方程,且方程①的解为非正数;方程②:
(k、m、n均为实数)为关于x的一元二次方程.
(1)求k的取值范围;
(2)如果方程②的解为负整数,
,
且k为整数,求整数m的值;
(3)当方程②有两个实数根
,
满足
,且k为正整数,试判断
是否成立?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7703b60466d39f34a41efda83425c336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572cfffc06489dd0060a32709ce14e6a.png)
(1)求k的取值范围;
(2)如果方程②的解为负整数,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfedf8fb674438c53e5990fa60dcc9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d3c29bd79f20d4c18b4d6f72734b1e.png)
(3)当方程②有两个实数根
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12a4eecd249473a831d0ee472470240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9565876bc50bceb63e5793c8c67a9032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11dc92978dd7aedbfc74c636e3341ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0b1281a9476eaac33c42c0538c2257.png)
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【推荐2】阅读材料,完成下列问题:
材料一:若一个正整数
是两个相差为
的正整数的乘积,即:
,其中
为正整数,则称
为“自信数”,
为
的“自信起点”,例如:
,则
是“自信数”,
为
的“自信起点”.
材料二:一个三位正整数A,去掉百位数字后得到一个新数,记这个新数与A的百位数字的平方的差为
,例如:
.
(1)填空:自信数
的自信起点是 ;
;
(2)若
和
都是“自信数”,且
的“自信起点”为
,
的“自信起点”为
,当
时,求
的值;
(3)若
是以
为“自信起点”的“自信数”,
(其中
,
,且
、
都是正整数),若
能被
整除,求
的最大值.
材料一:若一个正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc021ddcbbebd49d06d7168dc0e074c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767d2fde58230e8e11123114135cea91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
材料二:一个三位正整数A,去掉百位数字后得到一个新数,记这个新数与A的百位数字的平方的差为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01f11f9361a48ad480e079a2216354c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b6e5ddea0af4eca67c3fa4a867dcb7.png)
(1)填空:自信数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91488a5bb578d001827a4fd7a66b0592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cdf47cad5fef53247e7a1245d8e13cf.png)
(2)若
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a7a7db21d903aa5689bc642ef0915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c24f660f602420dc7521dd00c12287d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e689c77944a79ca81903eb62395017c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0c4bba1766eb0cd9c753f04dedb56c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90056d3a4d4286910bfcd3468487436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95a0353a11d59b2834ee1e7530029ea.png)
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【推荐1】模型建立:
(1)如图1,等腰直角
中,
,
,直线
经过点C,过A作
于D,过B作
于E.
求证:
;
模型应用:
(2)已知直线
:
与y轴交于A点,将直线
绕着A点顺时针旋转
至
,如图2,求
的函数解析式;
模型拓展:
(3)如图3,在直角坐标系中,点
,作
轴于点A,作
轴于点C,P是线段
上的一个动点,点
位于第一象限内.若
是不以A为直角顶点的等腰直角三角形,请求出点Q的坐标.
(1)如图1,等腰直角
![](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/323b786e35c9b762d00f2b2ef74ce1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b49434f8c1d76a4927047155f746628.png)
模型应用:
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6b28d3832f748441f80e9880bfa656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
模型拓展:
(3)如图3,在直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755ff27bc24c7ce3323ab818710500cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2485101d50dd5eef3e4fb242adfca527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b45db8dd8768994af51206565379fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764e71391d50a81fb5f2c0011977c25b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/5a557833-0ec6-41c8-89b4-20f2426f130d.png?resizew=408)
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【推荐2】在正方形ABCD中,
.
![](https://img.xkw.com/dksih/QBM/2022/6/29/3011964599369728/3049297974239232/STEM/2ab35498696a4b1f91280b062fa42305.png?resizew=546)
(1)如图1,点E、F分别在BC、CD上,且
,垂足为M,求证:
;
(2)点E在BC上,F是线段CD上一动点(不与端点重合).
①如图2,过F作
交射线AB于H,连结FA、FE,若AM=MF,BE=x,DF=y,则y与x之间的函数关系式为 ;
②如图3,已知E是BC的中点,若△AEF是等腰三角形,求CF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/2022/6/29/3011964599369728/3049297974239232/STEM/2ab35498696a4b1f91280b062fa42305.png?resizew=546)
(1)如图1,点E、F分别在BC、CD上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36622332ad675d5aed1ffe129f6f9755.png)
(2)点E在BC上,F是线段CD上一动点(不与端点重合).
①如图2,过F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1b3648f2bae98b0f154a13e176f6b3.png)
②如图3,已知E是BC的中点,若△AEF是等腰三角形,求CF的长.
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【推荐1】如图,
为
外接圆
的直径,
交
于点
,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952534693601280/2965821258260480/STEM/006323d27d6a4520ad2fbe25efa3a123.png?resizew=151)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
,
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad5e80406fa9f366098b25a89d78f59.png)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952534693601280/2965821258260480/STEM/006323d27d6a4520ad2fbe25efa3a123.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ef97163714de19a399efddd669ae52.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】在学习了三角形的知识后,数学兴趣小组的同学们又进一步对图形构造后的线段之间的关系进行了探究.
(一)尝试探究
在
中,
,
,点D为
的中点.
(1)如图,若点E,F分别为边
,
上的点,且
,请探究线段
与
之间的数量关系,并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/7b810a02-4544-4c44-9487-936225fa556c.png?resizew=149)
(2)如图,若点E在边
上,点M,F分别在
,
的延长线上,且
,求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/a94474a4-70ed-4c81-9a81-38a7df273882.png?resizew=168)
(二)应用拓展
(3)如图,在四边形
中,
,
,
,若
,
,请直接写出
的长.
(一)尝试探究
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(1)如图,若点E,F分别为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/7b810a02-4544-4c44-9487-936225fa556c.png?resizew=149)
(2)如图,若点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982f824aa56c399260dcf6e83d169344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14ce4fbc7d3e587b59a9ca117a5695f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/a94474a4-70ed-4c81-9a81-38a7df273882.png?resizew=168)
(二)应用拓展
(3)如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f54af2fca6a5d8bc36e8b489e8cbc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a91146605aff8a321203a5907143cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/2fad0a2f-6d1f-4cd6-8e25-861d71ba6bbd.png?resizew=144)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图1,在正方形
中,
,点O,E在边
上,且
,以点O为圆心,
为半径在其左侧作半圆O,分别交
于点G,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/b714a61e-ee5c-443b-adeb-cb75603ef010.png?resizew=466)
(1)
_______;
(2)将半圆O绕点E逆时针旋转
,点O的对应点为
,点F的对应点为
.
①如图2,若M为半圆
上一点,当点
落在
边上时,求点M到线段
的最短距离;
②如图3,当半圆
交
于P,R两点时,若
,求此时半圆
与正方形
重叠部分的面积;
③当半圆
与正方形
的边相切时,设切点为N,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd60303c0a793a28edf57595706678f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/b714a61e-ee5c-443b-adeb-cb75603ef010.png?resizew=466)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694e8e1384425dc3f7f80fedda9f7b8f.png)
(2)将半圆O绕点E逆时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91df6a17eb02cd79b377c99636a8697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
①如图2,若M为半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②如图3,当半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf4292170063641e068d2491482dfc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
③当半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43d3683e7f5aabe2eb2ae3da7188d96.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图1,在正方形ABCD中,E为AD边上一点,CO⊥BE交AB于F.EF交CB延长线于G.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977809647869952/2978671526535168/STEM/a28e7e7b-8a2e-4b5d-9614-a441b025fb98.png?resizew=363)
(1)当E为AD中点时,求证:BC=2BG;
(2)如图2,当BG=BC时,求证:
;
(3)在(2)的条件下,连接OD,求tan∠EOD的值.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977809647869952/2978671526535168/STEM/a28e7e7b-8a2e-4b5d-9614-a441b025fb98.png?resizew=363)
(1)当E为AD中点时,求证:BC=2BG;
(2)如图2,当BG=BC时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e6a82d61c40007a4618de6430e3958.png)
(3)在(2)的条件下,连接OD,求tan∠EOD的值.
您最近一年使用:0次