如图所示,在平面直角坐标系
中,在直线
处放置反光镜Ⅰ,在
轴处放置一个有缺口的挡板Ⅱ,缺口为线段
,其中点
,点
在点
上方,且
,在直线
处放置一个挡板Ⅲ,从点
发出的光线经反光镜Ⅰ反射后,通过缺口
照射在挡板Ⅲ上,则落在挡板Ⅲ上的光线的长度为_____ .
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2019·湖南株洲·中考真题 查看更多[6]
湖南省株洲市2019年中考数学试题人教版九年级下中考分类集训12 相似、投影与视图(已下线)【万唯原创】2020年河南省中考数学试题-河南试题正文-第一部分第四章4上(已下线)专题27.21+相似三角形应用举例(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)四川省成都市新都区教育科学研究院附属中学2023-2024学年八年级上学期期中数学试题四川省成都市天府第七中学2023-2024学年八年级上学期12月月考数学试题
更新时间:2019-07-18 21:30:35
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【推荐1】如图,在边长为4米的正方形场地
内,有一块以
为直径的半圆形红外线接收“感应区”,边
上的
处有一个红外线发射器,红外线从点
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【推荐2】图1是一种手机托架,使用该手机托架示意图如图3所示,底部放置手机处宽AB1.2厘米,托架斜面长BD6厘米,它有C到F共4个档位调节角度,相邻两个档位间的距离为0.8厘米,档位C到B的距离为2.4厘米.将某型号手机置于托架上(图2),手机屏幕长AG是15厘米,O是支点且OBOE2.5厘米(支架的厚度忽略不计).当支架调到E档时,点G离水平面的距离GH为__________ cm.
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【推荐1】如图,把矩形ABCD沿EF对折,使B与D重合,折痕EF交BD于G,连AG,若tan∠AGE=
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【推荐2】如图,等腰直角
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的
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交
于点F,连接
并延长,交
于N,
交
于点E.以下结论:①
②
③
④若
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