在
中,下列各式正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2022-06-20 15:10:11
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【推荐1】如图所示:测量队员在山脚
测得山顶
的仰角为
,沿着倾斜角为
的斜坡向上走
到达
处,在
处测得山顶
的仰角为
.若
,则山的高度约为( )
(参考数据:
)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f256afee1098dac22f423b19b43c89.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/dad2a36927223bd70f426ba06aea4b45.png)
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(参考数据:
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【推荐2】东汉末年的数学家赵爽在《周髀算经》中利用一副“弦图”给出了勾股 定理的证明, 后人称其为 “赵爽弦图”. 如图 1 , 它由四个全等的直角三 角形与一个小正方形拼成的一个大正方形. 我们通过类比得到图 2, 它是由三个全等的钝角三角形与一个小等边三角形
拼成的一 个大等边三角形
, 若
, 则
( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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A.5 | B.6 | C.7 | D.8 |
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【推荐1】如图所示,在等腰梯形
中,
,现将梯形
依次绕着
各点顺时针翻转,则在第一次绕着点
翻转的过程中,对角线
扫过的平面区域面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/e748e22a-cc92-41c8-b835-8383704dd89f.png?resizew=231)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】已知点
是椭圆
的左右焦点,点
为椭圆
上一点,点
关于
平分线的对称点
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上,若
,则椭圆
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