名校
1 . 某种水箱用的“浮球”是由两个相同半球和一个圆柱筒组成,它的轴截面如图所示,已知半球的直径是
,圆柱筒高
,为增强该“浮球”的牢固性,给“浮球”内置一“双蝶形”防压卡,防压卡由金属材料杆
,
,
,
,
,
及
焊接而成,其中
,
分别是圆柱上下底面的圆心,
,
,
,
均在“浮球”的内壁上,AC,BD通过“浮球”中心
,且
、
均与圆柱的底面垂直.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/dc7ac87c-0a51-4787-9f0f-8ee555d62ac2.png?resizew=121)
(1)设
与圆柱底面所成的角为
,试用
表示出防压卡中四边形
的面积
,并写出
的取值范围;
(2)研究表明,四边形
的面积越大,“浮球”防压性越强,求四边形
面积取最大值时,点
到圆柱上底面的距离
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc78a3b284e57c70528495772abb6af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba48323cd79d207715e82d1e5a7d5e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afb5c6e2d0469bfdec81be42542bdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2e528bb8fc7c95fec7ecc510d04034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85623f82c7d166bc6ae6b403cb5b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a5e3927b043383fcec844833d3f093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/dc7ac87c-0a51-4787-9f0f-8ee555d62ac2.png?resizew=121)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afb5c6e2d0469bfdec81be42542bdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539f8c8cb31e73da4f5d95afa046d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b12fcaf5c7aa1daf04b886fe618b621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)研究表明,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539f8c8cb31e73da4f5d95afa046d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539f8c8cb31e73da4f5d95afa046d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
您最近一年使用:0次
2019-12-22更新
|
439次组卷
|
3卷引用:重庆一中2021届高三高考数学押题卷试题(二)
重庆一中2021届高三高考数学押题卷试题(二)江苏省南京、海门、泗阳2019-2020学年度高三上学期教学质量调研(二)数学试题(已下线)2020届江苏省南通市如皋市高三上学期教学质量调研(二)数学(理)试题
2011·吉林·一模
2 . 如图所示,现有一张边长为
的正三角形纸片
,在三角形的三个角沿图中虚线剪去三个全等的四边形
,
,
(剪去的四边形均有一组对角为直角),然后把三个矩形
,
,
折起,构成一个以
为底面的无盖正三棱柱.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/77d9aa85-32ff-4c15-9fae-3525d8650737.png?resizew=165)
(1)若所折成的正三棱柱的底面边长与高之比为3,求该三棱柱的高;
(2)求所折成的正三棱柱的体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6293f10977e09f6bf2be1c49fb2c874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6e12f10fb9547f91fa055667d44cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698652bebc18c54983503d0a5ddb0bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813c279752688a5b0973b93812e35d9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16460e02999d0f8c2174df3c0cd21fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a6c0a9cd5dfdca74cdcf9186bde58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9c45578c43f597584d1b38730917e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/77d9aa85-32ff-4c15-9fae-3525d8650737.png?resizew=165)
(1)若所折成的正三棱柱的底面边长与高之比为3,求该三棱柱的高;
(2)求所折成的正三棱柱的体积的最大值.
您最近一年使用:0次
3 . 某商场为促销要准备一些正三棱锥形状的装饰品,用半径为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
的圆形包装纸包装.要求如下:正三棱锥的底面中心与包装纸的圆心重合,包装纸不能裁剪,沿底边向上翻折,其边缘恰好达到三棱锥的顶点,如图所示.设正三棱锥的底面边长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
,体积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572701048307712/1572701054648320/STEM/c5532a58bca34678ad425072446d7cd7.png)
(1)求
关于
的函数关系式;
(2)在所有能用这种包装纸包装的正三棱锥装饰品中,
的最大值是多少?并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b77fcbd8001b946d98b01b7d4999ab.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572701048307712/1572701054648320/STEM/c5532a58bca34678ad425072446d7cd7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在所有能用这种包装纸包装的正三棱锥装饰品中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
名校
解题方法
4 . 植物园拟建一个多边形苗圃,苗圃的一边紧靠着长度大于30m的围墙.现有两种方案:
![](https://img.xkw.com/dksih/QBM/2016/4/28/1572606217986048/1572606224203776/STEM/66658df360484c6296b2f4676a6853bf.png?resizew=469)
方案① 多边形为直角三角形
(
),如图1所示,其中
;
方案② 多边形为等腰梯形
(
),如图2所示,其中
.
请你分别求出两种方案中苗圃的最大面积,并从中确定使苗圃面积最大的方案.
![](https://img.xkw.com/dksih/QBM/2016/4/28/1572606217986048/1572606224203776/STEM/66658df360484c6296b2f4676a6853bf.png?resizew=469)
方案① 多边形为直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4d24165efcd72b9bc8698152a73a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd849437566efc72b3a74c73cd4727d.png)
方案② 多边形为等腰梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6ef2adfeef80ff867b6d0cbe56bff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf159818bae2ea575f1b010d503d72a.png)
请你分别求出两种方案中苗圃的最大面积,并从中确定使苗圃面积最大的方案.
您最近一年使用:0次
2016-12-04更新
|
621次组卷
|
3卷引用:2020届江苏省苏州市三校高三下学期5月联考数学试题
5 . 某商场为促销要准备一些正三棱锥形状的装饰品,用半径为
的圆形包装纸包装.要求如下:正三棱锥的底面中心与包装纸的圆心重合,包装纸不能裁剪,沿底边向上翻折,其边缘恰好达到三棱锥的顶点,如图所示.设正三棱锥的底面边长为
,体积为
.
![](https://img.xkw.com/dksih/QBM/2015/5/13/1572104523161600/1572104529076224/STEM/0b375ece20fb43059f9c4559d40145e7.png)
(1)求
关于
的函数关系式;
(2)在所有能用这种包装纸包装的正三棱锥装饰品中,
的最大值是多少?并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03503ec5895ad6dc94959c4c1e752df.png)
![](https://img.xkw.com/dksih/QBM/2015/5/13/1572104523161600/1572104529076224/STEM/0b375ece20fb43059f9c4559d40145e7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在所有能用这种包装纸包装的正三棱锥装饰品中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2012·湖北·一模
6 . 某地兴建一休闲商业广场,欲在如图所示的一块不规则用地规划建成一个矩形的商业楼区,余下作为休闲区域,已知
,且AB=BC=2AO=4km,曲线段OC是以O为顶点且开口向上的抛物线的一段,如果要使矩形的相邻两边分别落在AB、BC上,且一个顶点落在曲线段OC上,应如何规划才能使矩形商业楼区的用地面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fc2306af6525d36090cc4c33a919f3.png)
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570813750902784/1570813756383232/STEM/626cd4ba7f0a40daa49f1211f9dc5e3f.png)
您最近一年使用:0次