名校
解题方法
1 . 在大力推进城镇化的旧房改造进程中,晓颖家旧房拆迁拿到一套新房外加一间店面.晓颖准备将店面改建成超市,遇到如下问题:如图所示,一条直角走廊宽为2米,现有一转动灵活的平板车希望能自如在直角走廊运行.平板车平板面为矩形ABEF,它的宽为1米.直线EF分别交直线AC、BC于M、N,过墙角D作DP⊥AC于P,DQ⊥BC于Q;请你结合所学知识帮晓颖解决如下问题:
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621806592450560/2622046445330432/STEM/60fd26a8-72fd-41ed-8181-0df9f1730431.png)
(1)若平板车卡在直角走廊内,且∠
,试将平板面的长AB表示为
的函数
;
(2)证明:当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7373451770823b4883912c59a934a12d.png)
(3)若平板车要想顺利通过直角走廊,其长度不能超过多少米?
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621806592450560/2622046445330432/STEM/60fd26a8-72fd-41ed-8181-0df9f1730431.png)
(1)若平板车卡在直角走廊内,且∠
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44389c731b899312456a97207483b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd288d4152caf5fc8187a1a901c8949f.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45c89d1cb5a4f758539bdda2e31fa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7373451770823b4883912c59a934a12d.png)
(3)若平板车要想顺利通过直角走廊,其长度不能超过多少米?
您最近一年使用:0次
2020-12-25更新
|
166次组卷
|
2卷引用:江苏省南通市海安高级中学、南京市金陵中学2020-2021学年高一上学期阶段性检测数学试题
名校
2 . 如图,点
为某沿海城市的高速公路出入口,直线
为海岸线,
,
,
是以
为圆心,半径为
的圆弧型小路.该市拟修建一条从
通往海岸的观光专线
,其中
为
上异于
的一点,
与
平行,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/41a6e0c3-abe4-4327-b3ba-8da37d9a3e83.png?resizew=114)
(1)证明:观光专线
的总长度随
的增大而减小;
(2)已知新建道路
的单位成本是翻新道路
的单位成本的2倍.当
取何值时,观光专线
的修建总成本最低?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f412528e223f268ec4f0f3e268ced80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890f0b4e81634bb7e013412698640f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3bbc392095e3d64fc57dc1bc176e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513cb0e220a0fed33454151e303bcbe7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/41a6e0c3-abe4-4327-b3ba-8da37d9a3e83.png?resizew=114)
(1)证明:观光专线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3bbc392095e3d64fc57dc1bc176e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)已知新建道路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3bbc392095e3d64fc57dc1bc176e71.png)
您最近一年使用:0次
2019-08-23更新
|
317次组卷
|
3卷引用:江苏省无锡市2018届高三第一学期期末检测数学试卷
江苏省无锡市2018届高三第一学期期末检测数学试卷(已下线)专题4.1 任意角和弧度制及任意角的三角函数-《2020年高考一轮复习讲练测》(浙江版)(练)江苏省盐城市响水中学2020-2021学年高三上学期第三次学情分析考试数学试题