1 . 袋子中有若干除颜色外完全相同的黑球和白球,在第一次摸到白球的条件下,第二次摸到黑球的概率为
,第一次摸到白球且第二次摸到黑球的概率为
,则第一次摸到白球的概率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2008b78a906cf5ecdfd68432fa9ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
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2 . 关于
的不等式
有解,则实数
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b021b127a6d00ae353a46bf995427923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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3 . 已知关于
的不等式
(其中
)的解集中恰有两个整数,则实数
的取值范围是_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a9ee364e657e34bea8b4e808bd8c1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe90bc702b45f98d6c2eed989ffccdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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4 . 在
的展开式中,常数项为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6336bf2216ed0b079152d4ccca5b8bd6.png)
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5 . 已知数列
满足
,若
为数列
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8228283efaccfedc14911a97937fb8de.png)
_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70aa62d5dd947ec4d99ad3ef597937d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b6da7464d104521d6e068172f01504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70aa62d5dd947ec4d99ad3ef597937d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8228283efaccfedc14911a97937fb8de.png)
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6 . 已知等差数列
满足
,
为其前
项和,若
,
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4927f5e4c0004453b4071074b543fa71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10599e638e83e2b43b08315a7ba93517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655c46b33730f3a29b9ec3024df71375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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7 . 已知函数
有两个极值点,则实数
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b6744f7ea0d1d113c4045dbc860b55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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8 . 设随机变量
的方差
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5675ee83f5811e8e3dd582d4601e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bad91f78b253dfb36da6e3800e7e00.png)
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9 . 已知函数
有三个不同的零点
,
,
,且
,则实数a的取值范围是______ ;
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07ffbfce99b6152ce76eac188afeb2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded52999771182240a44aaa48cf8fc7a.png)
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10 . 某盒中有12个大小相同的球,分别标号为
,从盒中任取3个球,记
为取出的3个球的标号之和被3除的余数,则随机变量
的期望为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63aca6ebf2945c736087cd95c54b683c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
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