1 . 正多面体是指各个面都是全等的正多边形,并且各个多面角都是全等的多面角,又称为柏拉图多面体,因为柏拉图及其追随者对它们所作的研究而得名.自然界中有许多的柏拉图多面体,如甲烷、金刚石分子结构模型都是正四面体,氯化钠的分子结构模型是正六面体,萤石的结晶体有时是正八面体,硫化体的结晶体有时会接近正十二面体的形状……柏拉图多面体满足性质:
(其中V,F和E分别表示多面体的顶点数,面数和棱数).
(2)如图所示的正方体
中,点
为正方体六个面的中心,假设几何体
的体积为
,正方体
的体积为
,求
的值;
(3)判断柏拉图多面体有多少种?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a098e3851f80b3d3c273d34416c4778e.png)
(2)如图所示的正方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455cfa98d3b692be03f4e927d6a10b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4d86e8d1bef7032ab58f3c85d47c28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
(3)判断柏拉图多面体有多少种?并说明理由.
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2 . 在平面内有三个互不相交的圆,三个圆的半径互不相等.三个圆的方程分别为
.其中圆
与圆
的两条外公切线相交于点
,圆
与圆
的两条外公切线相交于点
,圆
与圆
的两条外公切线相交于点
,
表示直线AB的斜率,
表示直线AC的斜率,
表示直线BC的斜率.下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298d4f4782916ab6c13f27ac0d024054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
A.存在![]() ![]() |
B.对任意![]() ![]() |
C.存在点![]() |
D.直线![]() ![]() ![]() |
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2024高三·全国·专题练习
解题方法
3 . 正四棱锥
的外接球半径为R,内切球半径为r,求证:
的最小值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff3606c7bf728b4f539261461cde677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f190b17530d81d927c358ac84757a4.png)
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解题方法
4 . 在平面直角坐标系中,过直线
上任一点
作该直线的垂线
,
,线段
的中垂线与直线
交于点
.
(1)当
在直线
上运动时,求点
的轨迹
的方程;
(2)过
向圆
引两条切线,与轨迹
的另一个交点分别为
,
.
(i)证明:直线
与圆
也相切;
(ii)求
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236a066876764d090523afe0ea734a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50154acc6ad77c6c777fffe3a08afb59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f817fa2d2a8c4e38191900ed7730c879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(i)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(ii)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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解题方法
5 . 如图,
为圆锥
底面的直径,
,点
是圆
上异于
的动点,球
内切于圆锥(与圆锥底面和侧面相切),点
是球
与圆锥侧面的交线上的动点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/8ec47487-90ac-4dda-b11e-dc3fe0bde496.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fb50c66cd2de786b39cb442ec54a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8c91e4c85a9da7f54b2237d870a50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/8ec47487-90ac-4dda-b11e-dc3fe0bde496.png?resizew=175)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() |
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解题方法
6 . 如图,四棱柱
底面
是边长为2的正方形,侧棱
底面
,且
,P是线段
上一点(包含端点),Q在四边形
内运动(包含边界),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf90bac174f02c4552e56df4d910bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/8a840ee5-1b29-40d1-8635-750dbcd3d323.png?resizew=154)
A.该四棱柱能装下球的最大半径是1 |
B.点![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.![]() |
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7 . 已知
,点
为圆
上一动点,过点
作圆
的切线,切点分别为
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1aeb00e17bb5fe34dc23e42e23c76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
A.若圆![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.直线![]() ![]() |
D.![]() ![]() |
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8 . 如图,这是某同学绘制的素描作品,图中的几何体由一个正四棱锥和一个正四棱柱贯穿构成,正四棱柱的侧棱平行于正四棱锥的底面,正四棱锥的侧棱长为
,底面边长为6,正四棱柱的底面边长为
是正四棱锥的侧棱和正四棱柱的侧棱的交点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8969b40b7ded338cec0128fa40a291df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611122254dad4daf2a77259b675342bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
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2023-11-08更新
|
860次组卷
|
3卷引用:江西省赣州市十八县(市、区)二十三校2024届高三上学期11月期中联考数学试题
江西省赣州市十八县(市、区)二十三校2024届高三上学期11月期中联考数学试题上海市四校(复兴高级中学、松江二中、奉贤中学、金山中学)2024届高三下学期3月联考数学试卷(已下线)上海市四校(复兴高级中学、松江二中、奉贤中学、金山中学)2024届高三下学期3月联考数学试题变式题11-16
23-24高二上·全国·课后作业
9 . 设圆O的弦
的中点为M,过点M任作两弦
,弦
与
分别交
于点E,F.
的中点;
(2)如果将圆分别变为椭圆、双曲线或抛物线,你能得到类似的结论吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如果将圆分别变为椭圆、双曲线或抛物线,你能得到类似的结论吗?
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解题方法
10 . 已知
是半径为2的球面上的三个定点,且
,若
是该球面上的动点,且
,则下列结论正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ddc3178cc8ac2e034fe3b1723b4bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbddb854a1a634484936c64ab4a9102.png)
A.有且仅有两个点![]() ![]() |
B.有且仅有两个点![]() ![]() ![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
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