如图,在
中,
是
的直径,
是
的切线,切点是A,连接
,过点B作
,与
交于点C,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/14fb636e-c114-4b72-9d31-e80ea383e2b0.png?resizew=152)
(1)求证:
是
的切线;
(2)若
的半径为3,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e184d72e03673797f71c1d4e46c99c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/14fb636e-c114-4b72-9d31-e80ea383e2b0.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
22-23九年级上·江苏南京·期中 查看更多[10]
江苏省南京市玄武区2022-2023学年九年级上学期期中数学试题湖北省黄冈市部分学校2022—2023学年九年级上学期第二次测评数学试题湖北省黄冈市黄州区文都中学2022-2023学年九年级数学上学期第二次月考测试题 (已下线)湖北省恩施州利川市2022-2023学年九年级上学期期末数学试题变式题21-242023年湖南省娄底市中考二模数学试题河北省张家口市2022-2023学年九年级上学期期末数学试题(已下线)专题04 点和圆、直线和圆的位置关系(经典基础题8种题型+优选提升题)-【好题汇编】备战2023-2024学年九年级数学上学期期中真题分类汇编(苏科版)江苏省扬州市广陵区广陵区教师发展中心2023-2024学年九年级上学期期中数学试题福建省福州第八中学2023-2024学年九年级上学期月考数学试题广西北流市东湖初中联合体2023-2024学年九年级上学期期末数学试题
更新时间:2024-03-02 12:55:42
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,
,
.如果点P由B出发沿
向点A匀速运动,同时点Q由A出发沿AC向点C匀速运动.已知点P的速度为
,点Q的速度为
.连接
,设运动的时间为t(单位:s)(
)
(1)求
,
的长;
(2)当t为何值时,
与
相似.
(3)当t为何值时,
的面积为
面积的
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9381507466fa176fead3a254845c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d496c21a6705b3ff23fe492fbc581f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/5f23a97a-1c25-47a4-b35f-b64fcc0548ba.png?resizew=155)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca83504e351d7516f61a3052d7a31859.png)
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名校
【推荐2】阅读下列材料:解方程:
.这是一个一元四次方程,根据该方程的特点,它的解法通常是:设
,那么
,于是原方程可变为
①,解这个方程得:
当
时,
.
;当
时,
,以原方程有四个根:
.这个过程中,我们利用换元法达到降次的目的,体现了转化的数学思想.
(1)用换元法解方程:
时,若设
,则原方程可转化为____________;并求出x.
(2)
三边是a,b,c,若两直角边a,b满足
,斜边
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31c3deb75c70ab6dd2c2500c2baf39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ad7c068b9b7c0fd764cf7746407079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b02034e1538d11e67f0caecf8ed9dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6355c18e73ecf417b9b319530807a9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb035f529b3725290eeda9b7835590a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda6ab0f37a6a39baffa6c98dc11dc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35870839d6109f6ef48fa46339f4019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3db707c2f5d0f4889cef7035f97444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f0f6e564617f62091d1ef6d089d11e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a320dca840d943959a1ea6f7b19aac43.png)
(1)用换元法解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39385f73e2b54bb365d599e6652b78b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1078e43cbf5e587c89364d340f0dda.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04d10d590a65a6a17100be16ca60de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图①,内接于
,直线
与
相切于点D,
与
相交于点E,
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34035dfae0b08777722df29dfef847ee.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
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适中
(0.65)
【推荐2】正方形ABCD中,E是BC边上一点,以E为圆心、EC为半径的半圆与以A为圆心,AB为半径的圆弧外切, 求sin∠EAB的值.
![](https://img.xkw.com/dksih/QBM/2012/10/17/1573532708864000/1573532750553088/STEM/3376274777cd4897923860c985bfefd1.png?resizew=118)
您最近一年使用:0次
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适中
(0.65)
【推荐1】如图所示,在平行四边形ABCD中,∠A=90°,AB=6cm,BC=12cm,点E由点A出发沿AB方向向点B匀速移动,速度为1cm/s,点F由点B出发沿BC方向向点C匀速移动,速度为2cm/s,如果动点E、F同时从A、B两点出发,连接EF,若设运动时间为ts,解答下列问题.
![](https://img.xkw.com/dksih/QBM/2016/3/22/1574186327793664/1574186333364224/STEM/6611533a7eda48dcb826cc3b27d8e5a7.png)
(1)当t为 时,△BEF为等腰直角三角形;
(2)当t为 时,△DFC为等腰直角三角形;
(3)是否存在某一时刻,使△EFB∽△FDC?若存在,求出t的值,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/3/22/1574186327793664/1574186333364224/STEM/6611533a7eda48dcb826cc3b27d8e5a7.png)
(1)当t为 时,△BEF为等腰直角三角形;
(2)当t为 时,△DFC为等腰直角三角形;
(3)是否存在某一时刻,使△EFB∽△FDC?若存在,求出t的值,若不存在,请说明理由.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,弦
相交于点G,连接
.
;
(2)若C为
的中点,作
于E,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072a3ca34bd4b005e08839d2fb2ccb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551ff79eb95c75a638369d50556e4b1c.png)
(2)若C为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40800bd76a7ba9fd279b75c14187b602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
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