1 . 设复数
(i为虚数单位),z的共轭复数为
,则在复平面内i
对应的点的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a938e1164aea3b40ba26bcd8cd68b551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41042207515dd2e8349c805e6aee400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41042207515dd2e8349c805e6aee400.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . (多选)下列四个命题中正确的是( )
A.方程![]() |
B.方程![]() |
C.![]() ![]() |
D.![]() |
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3 . 下面是一次考试几个班同学的数学成绩(单位:分,满分为150分):
121,111,128,98,118,124,137,125,121,140,
129,122,101,103,134,126,129,132,99,132,
141,125,122,120,139,106,142,119,134,119,
122,126,114,141,132,125,111,145,110,123,
118,127,129,141,103,117,116,131,134,143,
113,142,125,136,119,110,107,124,137,100,
115,144,96,138,120,121,140,115,123,142,
119,133,120,146,119,144,119,122,119,136,
137,132,112,133,134,117,127,133,126,127,
141,119,131,131,123,128,133,126,129,134,
127,133,121,135,107,132,121,137,118,117,
107,133,131,131,125,126,140,127,114,136,
118,138,127,143,81,140,135,137,142,136,
139,124,138,119,122,136,141,119,118,114.
(1)你觉得怎样直观地表示出上述数据的大致分布情况(比如哪个分数段的人数比较多,哪个分数段的人数比较少)?
(2)画出频率分布直方图,看这次考试的整体分布,能说明哪些问题?
121,111,128,98,118,124,137,125,121,140,
129,122,101,103,134,126,129,132,99,132,
141,125,122,120,139,106,142,119,134,119,
122,126,114,141,132,125,111,145,110,123,
118,127,129,141,103,117,116,131,134,143,
113,142,125,136,119,110,107,124,137,100,
115,144,96,138,120,121,140,115,123,142,
119,133,120,146,119,144,119,122,119,136,
137,132,112,133,134,117,127,133,126,127,
141,119,131,131,123,128,133,126,129,134,
127,133,121,135,107,132,121,137,118,117,
107,133,131,131,125,126,140,127,114,136,
118,138,127,143,81,140,135,137,142,136,
139,124,138,119,122,136,141,119,118,114.
(1)你觉得怎样直观地表示出上述数据的大致分布情况(比如哪个分数段的人数比较多,哪个分数段的人数比较少)?
(2)画出频率分布直方图,看这次考试的整体分布,能说明哪些问题?
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名校
4 . 某校一名篮球运动员在五场比赛中所得分数分别为8,9,10,13,15,则该运动员在这五场比赛中得分的平均值为________ ,方差为________ .
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5 . 在
中,
,
,
,则
边上的高为___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783d6adfa8fb1352679c5185258d842a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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2023-07-10更新
|
524次组卷
|
2卷引用:1.6.2 正弦定理课时2 与三角形面积相关的问题 课时作业
6 .
的化简结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031d9f41143d68523207c0618e760146.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 设
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ced2d0a47bde59255f1adfe9a7252bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1783b1bc6ce3e967202be3ef7b043f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3672013580d0642e74bc78e4b55c818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e716d05bd0fa3cd03ef403996792d3.png)
A.11 | B.5 | C.-14 | D.10 |
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8 . 设等差数列
的前
项和是
,若
,则必定有( )
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27895a45f9083ed603eaa71b92636a61.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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9 . 下列说法正确的是( )
A.若![]() ![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() ![]() |
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