1 . 立德中学数学兴趣小组设计了一个方案来测量学校操场旗杆顶端距离地面的高度,具体步骤如下:①设旗杆与地面交于
点,②在
点的正西方
点测得旗杆顶端
的仰角为45°,③在
点南偏东60°的
点处测得点
的仰角为60°,④测得
,
两点处的距离为
米,则该旗杆顶端距离地面的高度为______ 米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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2021-08-11更新
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398次组卷
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3卷引用:江苏省无锡市2020-2021学年高一下学期期末数学试题
2 . 在社会生产生活中,经常会遇到这样的问题:某企业生产甲、乙两种产品均需用
两种原料.已知生产1吨每种产品需原料及每天原料的可用限额如表所示,如果生产 1吨甲、乙产品可获利润分别为4万元、6万元,问怎样设计生产方案,该企业每天可获得最大利润?我们在解决此类问题时,设
分别表示每天生产甲、乙产品的吨数,则
应满足的约束条件是
![](https://img.xkw.com/dksih/QBM/2018/5/14/1945307323318272/1947275692548096/STEM/39609f39f0094527891b960b51cbddad.png?resizew=536)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://img.xkw.com/dksih/QBM/2018/5/14/1945307323318272/1947275692548096/STEM/39609f39f0094527891b960b51cbddad.png?resizew=536)
A.![]() | B.![]() | C.![]() | D.![]() |
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2010·广东汕头·一模
3 . 在
中,
分别为内角
所对的边,且
.现给出三个条件:①
; ②
;③
.试从中选出两个可以确定
的条件,并以此为依据求
的面积.(只需写出一个选定方案即可)你选择的条件是____________ (用序号填写);由此得到的
的面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
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