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1 . 体积为27的正方体的顶点都在同一球面上,则该球面的表面积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 球面被平面所截得的一部分叫做球冠(如图).球冠是曲面,是球面的一部分.截得的圆叫做球冠的底,垂直于截面的直径被截得的一段叫做球冠的高.阿基米德曾在著作《论球与圆柱》中记录了一个被后人称作“Archimedes’ Hat-BoxTheorem”的定理:球冠的表面积
(如上图,这里的表面积不含底面的圆的面积).某同学制作了一个工艺品,如下图所示.该工艺品可以看成是一个球被一个棱长为4的正方体的六个面所截后剩余的部分(球心与正方体的中心重合),即一个球去掉了6个球冠后剩下的部分.若其中一个截面圆的周长为
,则该工艺品的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538030ee336830c75697bc2e9226a883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2d7c958e99bcd9d7f251c19ee3544.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 复数
的共轭复数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c692eeef173cbed7618b73869163dff.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 下列命题错误的是( )
A.若A、B、C是平面内的三点,则![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.向量![]() ![]() |
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5 . 在
中,过重心G的直线与
边交于P,与
边交于Q,点P,Q不与B,C重合.设
面积为
,
面积为
,
,
.
(1)求
;
(2)求证:
;
(3)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41f02922d11b0db07583b49135d73a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d9d8a55bf739736288c0be3607490a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9802946e68ae1c7153b4496ee14735.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08677c8308807e4dca6fd9410d301a39.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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6 . 已知
,
,
,
,则向量
在向量
上的投影向量为______ (用坐标表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4212e0f2da912518e8b02a741cc91ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a290a27cce9bd59bb6d79822473d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d6e498b0c1d1cedb86fe548f9fe79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0f23b0f0c453339d6db414305295d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1070a28cb9cb8553c29747d1993b16.png)
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7 . 设复数
,其中i为虚数单位,则下列正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f543c26ef2de07fb132ba386a8b498.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.方程![]() |
D.若![]() ![]() ![]() |
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8 . (1)化简下列各式:
①
;
②
.
(2)已知向量
,
,
与
的夹角为
.
①求
;
②求
.
(3)已知向量
,
.
①求
;
②若
,求实数
的值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4074b93ead6f32e784576801e5193c00.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bb22718194f581c971f54e7bc2e77a.png)
(2)已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29276b43a2950ed71f0f9629a35dfa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2396cac4b185cf1f1a67dad9248481c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e16eb319ee454088f5b527cf6c4d5.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af88a7628c71d642d3a6df067c15f5.png)
(3)已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5463fb0b7d03747aa4d680620ca81be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aabefecd4de8455e21919d34005588f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e6f98f23fea7db0f74897928024ca0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d209e529faa74004ca556cf3d6b321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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9 . 已知
,
,
、
的夹角
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daea8ad5e105672b93e68141bf4a4265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc0ebd5e4703a5515db4074731483f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72bf0fce80daad394f2a9d013829c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e746deaa1fb757d306e6764ddf92f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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解题方法
10 . 已知向量
,将向量
可绕坐标原点O逆时针旋转
角得到向量
(
),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082cb54dabbfbeb301d77dd32fdbbab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c342be3deeadb20d246f40e25ac9f6cc.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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