名校
1 . 如图,在
中,
,以
为直径作
,交
于点D,过点D作
,垂足为点E,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977750638411776/2978854755213312/STEM/b1b7a947a6af42118e1275f47a00a62a.png?resizew=197)
(1)求证:
是
的切线;
(2)若
的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977750638411776/2978854755213312/STEM/b1b7a947a6af42118e1275f47a00a62a.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/c382f42af05c1741fe8a9c81129989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
2022-05-14更新
|
305次组卷
|
3卷引用:广西壮族自治区贵港市桂平市2022-2023学年九年级上学期期末数学试题
2 . 如图,在
中,
是
边上一点,以O为圆心,
长为半径的圆分别交
于点
,点F是
边延长线上一点,连接
交
边于点G,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964552624840704/2967279379038208/STEM/7dec9d54-56a5-475a-8a07-2c5128d781e0.png?resizew=482)
(1)求证:
是
的切线;
(2)若
,求
的度数;
(3)如图2,在(2)的条件下,连接
交线段
于点M.若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa1a49afabd072a0a7ba97b65219632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562bbb984539f8180fde5203415fb95e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964552624840704/2967279379038208/STEM/7dec9d54-56a5-475a-8a07-2c5128d781e0.png?resizew=482)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)如图2,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a87efa1454c6082c9168c66b5a129f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415296f84bdf6f087f470a11ed596a13.png)
您最近一年使用:0次
3 . 阅读理解:如图①,在锐角
中,
、
、
的对边分别是a、b、c,过点A作
于点D,则
,即
,于是
,即
,所以
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9f3b03ef-b90b-43d6-ae19-5cd8b4c8aa08.png?resizew=345)
学以致用:(计算结果精确到0.1,
)
(1)如图②,
中,
,求
的度数和线段
的长;
(2)如图③,中国渔政204巡航船在C处测得岛屿A在北偏西
的方向上,随后船以40海里/时的速度往北偏东
的方向航行,半小时后到达B处,此时船在B处测得岛屿A在北偏西
的方向上,求此时船与岛屿A的距离
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c00ba79042bb355f8b86b3ccf0ee55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa591592655252976cc203a71f3805e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022ce20f86e08987e8ee52a68588a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819ec21933abc80320ae0cb5d1a3592b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1501d4035822b34fcc2378f1e316f159.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9f3b03ef-b90b-43d6-ae19-5cd8b4c8aa08.png?resizew=345)
学以致用:(计算结果精确到0.1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d4760148fc1f8e0881c73569079e8f.png)
(1)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf39489ac30869d6c9569c993f503f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图③,中国渔政204巡航船在C处测得岛屿A在北偏西
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391479c151307826c9765a47a5f10503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
真题
名校
4 . 在正方形
中,
,点E是
边的中点,连接
,延长
至点F,使得
,过点F作
,分别交
、
于N、G两点,连接
、
、
,下列正确的是:①
;②
;③
;④
( )
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752688934625280/2752907142275072/STEM/8637e802-e191-49a7-92f8-113ef25f907a.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.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/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662ecc67db7277595a0b53d8e218f799.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/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545ab3d89fdef2fde7eacef6e4094b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f22f249fe5eb43c85d7e0763bea3202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d2fa4f25550c83720d53dbf65dc0cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f663359d14d0bf973ddd5bebab7a660.png)
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752688934625280/2752907142275072/STEM/8637e802-e191-49a7-92f8-113ef25f907a.png?resizew=190)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次
2021-06-28更新
|
3424次组卷
|
13卷引用:2022年广西北部湾经济区初中学业水平考试数学模拟试题(三)
2022年广西北部湾经济区初中学业水平考试数学模拟试题(三)广东省深圳市2021年中考数学真题广东省深圳市深圳实验学校初中部2021-2022学年九年级上学期期中数学试题(已下线)专题28.12 《锐角三角函数》全章复习与巩固(培优篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)云南省云南大学附属中学2021-2022学年九年级上学期12月月考数学试题2022年广东省珠海市紫荆中学中考第一次模拟考试数学试题(已下线)专题20 多边形与四边形-备战2022年中考数学母题题源解密(广东专用)(已下线)热点09 平行四边形与特殊平行四边形-2022年中考数学【热点·重点·难点】专练(已下线)专题08 四边形中的计算选择题专项训练-备战2022年中考数学临考题号押题(全国通用)山东省济南市济南高新技术产业开发区2022-2023学年九年级上学期期中数学试题(已下线)专题28.4 锐角三角函数(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)2023年山东省日照市田家炳中学中考一模数学试题2023年内蒙古自治区呼和浩特市和林格尔县第三中学中考二模数学试题
5 . 如图,已知
,
是
的直径,
,
与
的边
,
分别交于点
,
,连接
并延长,与
的延长线交于点
,
.
是
的切线;
(2)若
,求
的值;
(3)在(2)的条件下,若
的平分线
交
于点
,连接
交
于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8751f226cdfbff4119a12c75a8df30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e698404fde91350c873592032ea5326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d064fe2ab8e07d61773c9a8217eb7972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f358cc1c7ab5db661d488bbcefb491f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41891a88de00362b19c713d491dca6a.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215e8dadb4a11e0d1650dfae207d1137.png)
您最近一年使用:0次
2021-06-28更新
|
2499次组卷
|
5卷引用:广西北部湾经济开发区2021年中考数学真题
广西北部湾经济开发区2021年中考数学真题广西来宾市2021年中考数学真题(已下线)专题21 以圆为载体的几何综合探究问题2022年四川省绵阳市高中阶段招生暨初中毕业水平考试数学诊断卷(八)(已下线)专题3.56 圆中的相似问题(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)
真题
解题方法
6 . 如图,在平面直角坐标系中,
的边
在
轴上,
,且线段
的长是方程
的根,过点
作
轴,垂足为
,
,动点
以每秒1个单位长度的速度,从点
出发,沿线段
向点
运动,到达点
停止.过点
作
轴的垂线,垂足为
,以
为边作正方形
,点
在线段
上,设正方形
与
重叠部分的面积为
,点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/2021/6/26/2751481535488000/2752576205463552/STEM/7647306c-57dd-40a5-9f5e-f2a6d7d90784.png?resizew=272)
(1)求点
的坐标;
(2)求
关于
的函数关系式,并写出自变量
的取值范围;
(3)当点
落在线段
上时,坐标平面内是否存在一点
,使以
为顶点的四边形是平行四边形?若存在,直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cf17ee13e937cd8b84879da17d15b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0b663c96a45e8031dde30026ad204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9ef2b0fd5b74974b9db2009c597af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f557eae3d32701ac70c08a9dae7484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f786184522af88af32b90f8c31bd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f786184522af88af32b90f8c31bd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://img.xkw.com/dksih/QBM/2021/6/26/2751481535488000/2752576205463552/STEM/7647306c-57dd-40a5-9f5e-f2a6d7d90784.png?resizew=272)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bce22c510db1fb9262bb5736974a155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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6卷引用:黄金卷2-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广西新中考专用)
(已下线)黄金卷2-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广西新中考专用)黑龙江省龙东地区(农垦 森工)2021年中考数学真题黑龙江省龙东地区2021年中考数学真题(已下线)黑龙江省鹤岗市2021年中考数学真题(已下线)第18讲 二次函数中特殊几何图形存在性(探究性)问题-【暑假自学课】2022年新九年级数学暑假精品课(人教版)2024年吉林省初中学业水平考试(中考)模拟预测题
真题
7 . 如图,菱形ABCD的四个顶点均在坐标轴上,对角线AC、BD交于原点O,
于E点,交BD于M点,反比例函数
的图象经过线段DC的中点N,若
,则ME的长为( )
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748338072797184/2748430049525760/STEM/eb8466b3-239c-42ed-84e4-453181c63f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b66bfc4142107472444b28926b643e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748338072797184/2748430049525760/STEM/eb8466b3-239c-42ed-84e4-453181c63f18.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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11卷引用:2023年广西壮族自治区玉林市玉州区中考一模数学试题
2023年广西壮族自治区玉林市玉州区中考一模数学试题湖南省怀化市2021年中考真题数学试题(已下线)专题28.4+锐角三角函数(培优篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)(已下线)(广东广州卷)2022年中考数学第一次模拟考试2022年四川省自贡市富顺县九年级下学期数学第二次练习题2022年贵州省玉屏侗族自治县九年级下学期第二次模拟考试数学试题2022年河南省南阳市镇平县九年级中招模拟训练数学试卷(二)2022年山东省聊城市东阿县中考三模数学试题(已下线)专题28.4 锐角三角函数(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题10 反比例函数-学易金卷:三年(2021-2023)中考数学真题分项汇编(湖南专用)(已下线)专题12 函数综合-学易金卷:三年(2021-2023)中考数学真题分项汇编(湖南专用)
真题
名校
8 . 如图,在边长为6的等边
中,点
,
分别是边
,
上的动点,且
,连接
,
交于点
,连接
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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21卷引用:广西南宁市三美学校2021-2022学年九年级上学期第三阶段素质评价数学试题
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9 . 如图,已知AB是⊙O的直径,C是⊙O上的一点,D是AB上的一点,DE⊥AB于D,DE交BC于F,且EF=EC.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712440039768064/2715225006972928/STEM/26095511-d231-420a-926c-5f0b4177a42b.png?resizew=165)
(1)求证:EC是⊙O的切线;
(2)求证:△OAC∽△ECF
(3)若BD=4,BC=8,圆的半径OB=5,求切线EC的长.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712440039768064/2715225006972928/STEM/26095511-d231-420a-926c-5f0b4177a42b.png?resizew=165)
(1)求证:EC是⊙O的切线;
(2)求证:△OAC∽△ECF
(3)若BD=4,BC=8,圆的半径OB=5,求切线EC的长.
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3卷引用:2021年广西南宁市马山县中考第一次适应性检测数学试题
10 . 如图,在正方形网格中,点
都是小正方形的顶点,
与
相交于点
,则
的值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18df54641f9144727776b2c0676a4a02.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2645311946260480/2666368750059520/STEM/0471e934-94e0-48b9-87c9-923c062b47d2.png?resizew=226)
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