在平面直角坐标系中,菱形
的位置如图所示,其中点
的坐标为
,第1次将菱形
绕着点
顺时针旋转
,同时扩大为原来的2倍得到菱形
(即
),第2次将菱形
绕着点
顺时针旋转
,同时扩大为原来的2倍得到菱形
(即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2314397acf3bf2bc1933b239e1ca7e.png)
),第3次将菱形
绕着点
顺时针旋转
,同时扩大为原来的2倍得到菱形
(即
)…依次类推,则点
的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f35d4ede5b91b03d09a99262de2693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b573d2808aad1d098a5c41a55f338b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f35d4ede5b91b03d09a99262de2693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffbf8da591ea12fb59a5dad95dccd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2314397acf3bf2bc1933b239e1ca7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9508b8a9a1a6ec76b6a50d0e2c556b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffbf8da591ea12fb59a5dad95dccd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753690831380320812b972727dd77c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b984fb343b0b1af5afe79e0eb7d48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df4c1fbc5cff902a8b9936dcb07e11b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/6b2cd542-0322-44e0-ac61-707f5e877f26.png?resizew=264)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-09-27 05:27:25
|
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【推荐1】如图,在平面直角坐标系中,将
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【推荐2】如图,已知点A,B的坐标分别为(0,0),(4,0),将△ABC绕点A按逆时针方向旋转90°得到△AB′C′.点格点C′的坐标( )
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【推荐1】如图①,在
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【推荐2】江津四面山是国家5A级风景区,里面有一个景点被誉为亚洲第一岩﹣﹣土地神岩,土地神岩壁画高度从石岩F处开始一直竖直到山顶E处,为了测量土地神岩上壁画的高度,小明从山脚A处,沿坡度i=0.75的斜坡上行65米到达C处,在C处测得山顶E处仰角为26.5°,再往正前方水平走15米到达D处,在D处测得壁画底端F处的俯角为42°,壁画底端F处距离山脚B处的距离是12米,A、B、C、D、E、F在同一平面内,A、B在同一水平线上,EB⊥AB,根据小明的测量数据,则壁画的高度EF为( )米(精确到0.1米,参考数据:sin26.5°≈0.45,cos26.5°≈0.9,tan26.5°≈0.5,sin42°≈0.67,cos42°≈0.74,tan42°≈0.9)
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