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解题方法
1 . “九子游戏”是一种传统的儿童游戏,它包括打弹子、滚圈子、踢毽子、顶核子、造房子、拉扯铃子、刮片子、掼结子、抽陀子九种不同的游戏项目,某小学为丰富同学们的课外活动,举办了“九子游戏”比赛,所有的比赛项目均采用
局
胜的单败淘汰制,即先赢下
局比赛者获胜.造房子游戏是同学们喜爱的项目之一,经过多轮淘汰后,甲、乙二人进入造房子游戏的决赛,已知每局比赛甲获胜的概率为
,乙获胜的概率为
.
(1)若
,设比赛结束时比赛的局数为
,求
的分布列与数学期望;
(2)现有两种赛制:赛制一:采用3局2胜制,赛制二:采用5局3胜制,乙选手要想获胜概率大,应选哪种赛制?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645970cc4782f567f129901655df0997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)现有两种赛制:赛制一:采用3局2胜制,赛制二:采用5局3胜制,乙选手要想获胜概率大,应选哪种赛制?并说明理由.
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2 . 已知某种塑料经自然降解后残留量y与时间t年之间的关系为
,
为初始量.则该塑料经自然降解,残留量不超过初始量的50%.至少需要( )年(精确到年).(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a3b21c4ebd37ab3ca3080b7ee73879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8112f9185c7d48b015d9cd0525616b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef98775e12ea3852135792e34526a519.png)
A.5 | B.6 | C.7 | D.8 |
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3 . 设命题
:对任意的等比数列
也是等比数列,则命题
的否定
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a54bf8d60932de0f8013530a21a18ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
A.对任意的非等比数列![]() |
B.对任意的非等比数列![]() |
C.存在一个等比数列![]() ![]() |
D.存在一个等比数列![]() ![]() |
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4 . 已知双曲线
的一条渐近线的倾斜角为
,则此双曲线的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29c0738fd840c1acadc91365ff366f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76dde16b05fba6fc61779511e63f34fe.png)
A.![]() | B.![]() | C.2 | D.![]() |
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5 . 设
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67c6f49685d2d8933c12bc3014d9f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9c3d509e77d6a7e4874302308c2aba.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 .
展开式的7项中,系数为有理数的项共有( )项
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62a5d92a606975d5d0218bdde791ac6.png)
A.1 | B.2 | C.3 | D.4 |
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解题方法
7 . 对于数列
,如果存在等差数列
和等比数列
,使得
,则称数列
是“优分解”的.
(1)证明:如果
是等差数列,则
是“优分解”的.
(2)记
,证明:如果数列
是“优分解”的,则
或数列
是等比数列.
(3)设数列
的前
项和为
,如果
和
都是“优分解”的,并且
,求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd84622d5883097a686797889192356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)证明:如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33119e0b8e033e27fde4505b90a1c3b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238024e8fa2058c5cbbf2f757ce9a997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e274217ecbdfeea729eaa317359e77.png)
(3)设数列
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15ebc127b977d405b867a151696b163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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5卷引用:湖北省武汉市华中师范大学第一附属中学2024届高三五月适应性考试数学试卷
8 . 己知圆
,动圆
与圆
相内切,且经过定点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd05f98ba823ac788d3c228d6900191d.png)
(1)求动圆圆心
的轨迹方程;
(2)若直线
与(1)中轨迹交于不同的两点
,记
外接圆的圆心为
(
为坐标原点),平面上是否存在两定点
,使得
为定值,若存在,求出定点坐标和定值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4957438e7f49ced0368ec80649c01ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd05f98ba823ac788d3c228d6900191d.png)
(1)求动圆圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4147f37263dc5cdebcf9d53b758977dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa69fd8445d01c98634c2e885b47d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea54c2ea0a0c788a4d85f8d687c45966.png)
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解题方法
9 . 已知菱形
,
,将
沿对角线
折起,使以
四点为顶点的三棱锥体积最大,则异面直线
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf80b036459da6dcb841a4bbe3859fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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|
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解题方法
10 . 已知复数
满足
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a1621cb90522c90545c3372fade212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe708b41ce87fc158edbb43135c14d3d.png)
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|
1327次组卷
|
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