名校
1 . 已知圆
是圆
外一点,过点
作圆
的两条切线,切点分别为
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103d4b06eceaa9d448916afd915cafd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eb29f0d8bd81c64e4be3824fae3c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74518fed7a017a94f2b77a50148cf12c.png)
A.![]() | B.3 | C.![]() | D.![]() |
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名校
2 . 已知集合
,则
的子集个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d744214aad8cb371df0286db1c0255f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.4 | B.7 | C.8 | D.16 |
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3 .
的展开式中,含
的项的系数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8bc3e5da0891d8837d868d2011c962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444b7c16b01e374ab6b6cfbb51add3cd.png)
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4 . 已知
,若实数m,n满足
,则
的最小值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e74a6ed0b5422459d019ffeb752158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de3aec7dea25bff9b87f12fe41a8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c9cceb3285ab068493b820d03effa7.png)
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5 . 已知圆台
的上底面积为
,下底面积为
,且其外接球半径
,则该圆台的高为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a39dce3f1e36dbe01293c309816968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc2a78406f5e1e9936c60851f6e9500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d24cb5c388513e7ab4f1db7efdc9ead.png)
A.6或7 | B.8或12 | C.6或8 | D.7或12 |
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解题方法
6 . 若正四面体
的棱长为
,M为棱
上的动点,则当三棱锥
的外接球的体积最小时,三棱锥
的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d90f940f5693b22ddf2e7c761887d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d90f940f5693b22ddf2e7c761887d8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 记
为等差数列
的前
项和,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52ff4f2d9a76730a7ff5baf43da46f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5b69c559d2337b18bb3553df151617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
A.40 | B.60 | C.76 | D.88 |
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8 . 过椭圆
的右焦点
且不与坐标轴垂直的直线
交
于
两点,
的垂直平分线交
轴于点
,交直线
于点
.
(1)
为坐标原点,求
的取值范围;
(2)若
四点在同一圆上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cefeb5c389a37a71e5fd3925f5954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2288109e13b7dd099f8dba9bd4997c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071081b9a1b64f65c6b74e5f96a786eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
9 . 已知集合
,集合
满足:①每个集合都恰有4个元素;②
.集合
中元素的最大值与最小值之和称为集合
的特征数,记为
,则
的最大值与最小值的差为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8ba1e4fc97b6aae170ba402f00a06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa157b4f65f3a9aa1f7f82de02e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d343d79a12548d8e4f5b1dd6dd9bf2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed5791766a68be89ceda7f1505e4fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977596d92064cd96041927d539b09731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eced34833fc5ee8ad2c6817ced270988.png)
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10 . 数学中有各式各样富含诗意的曲线,螺旋线就是其中一类,螺旋线这个名词源于希腊文,它的原意是“旋卷”或“缠绕”.如图所示,正六边形
的边长为1,分别取其各条边的四等分点,连接得到正六边形
,再取其各条边的四等分点,连接得到正六边形
,依次类推…对于阴影部分,记第一个阴影
的最大边长为
,面积为
;第二个阴影
的最大边长为
,面积为
,第三个阴影三角形的最大边长为
,面积为
,依次类推….则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0bd58152e714896a2ca1edeb0f6b53c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9956cc47cdeaadb0cc3ca4157cd8e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47857b8805bf9bbb7f83a6244f2a13d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a562e89414df5d11bb7dcd1303786b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f7f70287861a073e5923c418acaed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
A.数列![]() ![]() |
B.![]() |
C.任意阴影三角形的最小角的余弦值为![]() |
D.数列![]() ![]() |
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