在平面直角坐标系中,点
是一个光源,木杆
两端的坐标分别是
,
,则木杆
在x轴上的投影
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497911bc462170183e81d95bd509b70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce2830528c2ea6b5d4df0c77644e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
A.4 | B.![]() | C.![]() | D.5 |
2023·浙江嘉兴·一模 查看更多[6]
2023年浙江省嘉兴市南湖区中考一模数学试题浙教版九年级下册第三章投影和三视图单元测试数学试题(已下线)专题18投影 (4个知识点3种题型1种中考考法)-【帮课堂】2023-2024学年九年级数学上册同步学与练(北师大版)33-视图与投影29.1投影29.1投影课后作业B层
更新时间:2023-04-23 20:14:07
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【推荐1】已知直线l:
与直线
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的解析式是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,矩形
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,点A的坐标为
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与x轴交于点B,与y轴交于点C,点D在直线
上运动,当线段
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,直线
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【推荐1】圆桌面(桌面中间有一个直径为1m的圆洞)正上方的灯泡(看作一个点)发出的光线照射平行于地面的桌面后,在地面上形成如图所示的圆环形阴影.已知桌面直径为2m,桌面离地面1m,若灯泡离地面2m,则地面圆环形阴影的面积是( )
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【推荐2】如图所示是两根标杆在地面上的影子,根据这些投影,在灯光下形成的影子是( )
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