名校
1 . 乒乓球,被称为中国的“国球”.某次比赛采用三局两胜制,当参赛选手甲、乙两位中有一位赢得两局比赛时,就由该选手晋级而比赛结束.每局比赛都要分出胜负,且每局比赛的胜负不受之前比赛结果影响.假设甲在任一局赢球的概率为
,有选手晋级所需要的比赛局数的期望值记为
,则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09ff35a01b538c6383ede0fc2aa7acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a0be4eebc5d70c51f72f28dbfc11e9.png)
A.打满三局结束比赛的概率为![]() | B.![]() |
C.函数![]() ![]() | D.![]() |
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解题方法
2 . 已知函数
的定义域为R,且
,则下列结论一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c744ee4528f4803d5d5710e2b27bf8c.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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解题方法
3 . 已知函数
,(
,且
).
(1)当
时,求函数
的单调区间;
(2)是否存在实数
,使得函数
在区间
上取得最大值2?若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b1f2e90f61b09074bbd6526d86aa25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dad34d17f6abd936f417d907822d00f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
4 . 已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
,求
的单调区间;
(2)记
在
上的最小值为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b464f310ae4172d51ebf55129fbe577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8e1dd8da540badcb9a8f427c5b202e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ead3fdcb8fe8f5eb3dbe7d96cabc28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b3ae7e5228fd1acb0d46f6941143a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b3ae7e5228fd1acb0d46f6941143a7.png)
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5 . 已知函数
的定义域为
.
(1)若
是单调函数,且有零点,求实数a的取值范围;
(2)若
,求
的值域;
(3)若
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80923212fb2e77439887f6bbc204d177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e91676c7adfd65a76f56a0c1d4bbe0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62012e3b5e54be956b0bb296a6fa7f3.png)
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6 . △ABC的三内角A,B,C所对的边分别为a,b,c,若cosA=
cosB,b=
,c=4,M,N是边AC上的两个动点,且AM=2CN,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ca0fcaa1c3130405d16a3b8737215f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf19e7eecd90e30f6879e9405ff2210.png)
您最近一年使用:0次