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解题方法
1 . 甲、乙两人组成“星队”参加猜成语活动,每轮活动由甲、乙各猜一个成语,已知甲每轮猜对的概率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
乙每轮猜对的概率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
在每轮活动中,甲和乙猜对与否互不影响,各轮结果也互不影响,记甲在第
轮猜对成语为事件
,乙在第
轮猜对成语为事件![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc5c895153932c3e827a464664cef90.png)
.
(1)求甲在两轮活动中恰好猜对1个成语的概率;
(2)求“星队”在两轮活动中共猜对3个成语的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc5c895153932c3e827a464664cef90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b52faa6703492e49a2058ce6fc29f2.png)
(1)求甲在两轮活动中恰好猜对1个成语的概率;
(2)求“星队”在两轮活动中共猜对3个成语的概率.
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2 . (1) 化简 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a896a89ede966ea5b07e73cbf6dde8.png)
(2) 若
,且
、
都是锐角,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a896a89ede966ea5b07e73cbf6dde8.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a377adce5d2bed23c30ecbbf887934e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfea1e888676a13ad69c72fba0405ea.png)
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3 . 如图,在正三棱柱
中, 点 D在边
上,
.
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)如果点E是
的中点, 求证:
平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc80093eab6bfbba801d92b57d576b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)如果点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab35850dbc661ded6456b70767cc6cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d560542b646924eaf577480ac73281b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
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4 . 已知关于
的不等式
,若此不等式的解集为
,则实数m的取值范围是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc36100e96939a533e4e6ed8fdac303a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a837165ca03f9e4ea8964979c95e3bb.png)
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5 . 已知
则复数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd6ffa9a48b87b3bd61dacc83c56674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
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6 . 记“抛掷一颗骰子,向上的点数是4,5,6”为事件
,“抛掷一颗骰子,向上的点数是1,2”为事件
,“抛掷一颗骰子,向上的点数是1,2,3”为事件
, “抛掷一颗骰子,向上的点数是1,2,3,4”为事件
,下列判断正确的有 ( )个
①
与
互斥; ②
与
对立; ③
与
对立; ④
与
互斥;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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7 . 数学兴趣小组有3名男生和2名女生,现从中任选2人参加校数学竞赛,则参赛学生中至少有1名男生的概率是 ( )
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 将函数
图象上每个点的横坐标变为原来的
倍,在将得到的图象向左平移
个单位,所得图象的解析( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeb076bad84890e24dbdc945ad543cb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 一组数据1,5,2,3,4的标准差和上四分位数分别是 ( )
A.2,4 | B.![]() | C.2,2 | D.![]() |
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10 . 已知圆台的上下底面圆的半径分别为2和5,高为4,则这个圆台的母线长为( )
A.3 | B.![]() | C.5 | D.![]() |
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