名校
1 . 如图,某生态农庄内有一直角梯形区域
,
,
,
百米,
百米.该区域内原有道路
,现新修一条直道
(宽度忽略不计),点
在道路
上(异于
,
两点),
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/871fbe40-f443-44da-b62f-16a5b986724b.png?resizew=181)
(1)用
表示直道
的长度;
(2)计划在
区域内种植观赏植物,在
区域内种植经济作物.已知种植观赏植物的成本为每平方百米2万元,种植经济作物的成本为每平方百米1万元,新建道路
的成本为每百米1万元,求以上三项费用总和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954d2fd2aecd31ff67d975bc8981023a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59711bd8b634ea563537f34ed82c562f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/871fbe40-f443-44da-b62f-16a5b986724b.png?resizew=181)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
(2)计划在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
您最近一年使用:0次
2 . 如图,
,
,
为山脚两侧共线的三点,在山顶
处观测三点的俯角分别为
,
,
.现测得
,
,
,
,
,
.计划沿直线
开通一条穿山隧道,试求出隧道
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187d53d54bfd60a5dae95aed0d0a94ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cc4b45adfdf2ccae5f0a8954a19cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff5eccf3105827288f9bc0ad1c1185b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8683abc968e6432ecba5872ae2cccf27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779b92caa9e7788a6f556304b3093db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c08aec674a2358db8ef49f7fdcd85c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/b8b1ce45-532c-4766-b061-f18ba547b43c.png?resizew=445)
您最近一年使用:0次
2021-05-31更新
|
696次组卷
|
4卷引用:江苏省南通市2021届高三下学期5月四模数学试题
江苏省南通市2021届高三下学期5月四模数学试题广东省2022届高三上学期调研仿真数学试题云南省昭通市第一中学2022-2023学年高一下学期3月月考数学试题(已下线)6.4.3 余弦定理、 正弦定理 第3课时 余弦定理、正弦定理应用举例(分层作业)-【上好课】