名校
解题方法
1 . 如图,四棱锥
中,底面
是矩形,PD垂直底面,E,F分别是棱PC,PA上的点,满足
已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ff716faec70fe58253a2ab85613551.png)
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827178c2b37bd9bd69c386622697784f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ff716faec70fe58253a2ab85613551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
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解题方法
2 . 在直三棱柱
中,
是棱
上一点,平面
将直三棱柱
分成体积相等的两部分.若
四点均在球
的球面上,则球
的体积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4eb4295063bc2228b610a53f3079153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80fcad79e91512c70ac0a7525b4b5537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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3 . 已知数列
:
的各项均为正整数,设集合
,记
的元素个数为
.
(1)若数列
:
,且
,
,求数列
和集合
;
(2)若
是递增的等差数列,求
的值(用
表示),并说明理由;
(3)请你判断
是否存在最大值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9ef2e730239fb441c867d6ab4d9b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f05a921b593d6e1bedfd6c28b60f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a318eb5a4da016d3d993175e845a90ab.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab8cdaf36beae93dd45c27981cb75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc668d959b811bef55a1e672eb1dcec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f255d89ed61b51eb161d74e518b9a763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a318eb5a4da016d3d993175e845a90ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)请你判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a318eb5a4da016d3d993175e845a90ab.png)
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4 . 已知函数
是定义在
上的增函数,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c988517df0e5aaf84e6ea63dcf0444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 在长方体
中,底面
为正方形,
,其外接球的体积为
,则此长方体的表面积为______ .
![](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/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4d9a7c9b2ee0253a3a11d5117f9f49.png)
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6 . 一个暗箱中装有若干个大小相同的红球、白球和黑球,每次从中摸出1个球,直到摸出的球有三种颜色为止,若小明第4次摸球后终止摸球,则他摸球的情形有( )
A.9种 | B.12种 | C.18种 | D.24种 |
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7 . 设
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1563c592e9b3be0fe80d3e82a571c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18cf24a502948815c320617f661b1fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e89196544aae660dc0e6c8ce761ade.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 下列各组函数中,两个函数表示同一个函数的是( )
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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9 . 在平行四边形
中,
,点
为该平行四边形所在平面内的任意一点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b93b4f5d40351a85c0c027562c20c1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c169cec0a60d31fd6c56e4cd9b1e0063.png)
A.6 | B.8 | C.10 | D.12 |
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10 . 平面向量
满足:
,
,
,且
,
,则
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1c5bcaa260128e281a12f6ef6aacbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd522bfa5a73cc24b727dfb9662bdaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea232dab65fe1923a65165af2b71be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21fbace96e8534be487ab6d983c43d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2396cac4b185cf1f1a67dad9248481c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18adcd988d80833c5d730bdc2529e21.png)
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