解题方法
1 . 如图,在平行四边形
中,
,点
是
边上一点,且
,记
为
的面积,
为
的面积,则当
取得最小值时,
( )
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723550230929408/2724651944484864/STEM/b95be7e5-6e15-4d02-bdca-763d837212c0.png?resizew=285)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01990b533d5197e9af41a8150da5b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3a6dcaf9f9e9a940b4a16f7ec2fc2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2a8bf5e05a07c93a7104839fc21849.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723550230929408/2724651944484864/STEM/b95be7e5-6e15-4d02-bdca-763d837212c0.png?resizew=285)
A.![]() | B.![]() | C.![]() | D.![]() |
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3卷引用:河南省2021届高三仿真模拟考试数学(理科)试题
河南省2021届高三仿真模拟考试数学(理科)试题安徽省皖淮名校2020-2021学年高二下学期5月联考文科数学试题(已下线)考点03 正弦、余弦定理-2022年高考数学(文)一轮复习小题多维练(全国通用)
解题方法
2 . 做一个无盖的圆柱形水桶,若要使其体积是
,且用料最省,则该圆柱形水桶的高为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178ec48ec6dec55778c74962a928d600.png)
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3卷引用:内蒙古包头市2021届高三第一次模拟考试数学(理)试题
解题方法
3 . 设球的半径为
,该球的内接圆锥(顶点在球面上,底面为某平面与球的截面)的体积为
,则
的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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7卷引用:四川省遂宁等八市联考2021届高三第二次诊断考试数学理科试题
四川省遂宁等八市联考2021届高三第二次诊断考试数学理科试题四川省遂宁等八市联考2021届高三第二次诊断考试数学文科试题四川省九市(眉山、广安、遂宁、资阳、雅安、乐山、内江、自贡、广元)2021届高三二模数学文科试题四川省九市资阳、雅安、乐山、内江、眉山、广安、遂宁、自贡、广元2021届高三二模数学(理科)试题(已下线)押第16题 球与几何体的切接-备战2021年高考数学(文)临考题号押题(全国卷1)(已下线)押第16题 球与几何体的切接-备战2021年高考数学(理)临考题号押题(全国卷1)(已下线)押第16题 立体几何综合-备战2021年高考数学(文)临考题号押题(全国卷2)
4 . 直六棱柱的底面是正六边形,其体积是
,则该六棱柱的外接球的表面积的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3卷引用:四川省泸州市2021届高三第二次质量诊断理科数学试题
名校
5 . 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)
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2019-12-22更新
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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