1 . (1)计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54a63e17d98d186c5e61f320ef0dfce.png)
________ (请用数字作答).
(2)已知
,则实数x的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54a63e17d98d186c5e61f320ef0dfce.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a0d736c92a8a65d7d3e7f06dcb846.png)
您最近一年使用:0次
解题方法
2 . 《扫雷》是一款益智类的小游戏,游戏要求玩家在方格中点击若干次,排除所有无雷的格子即算成功.方格中的数字代表其周围8格的地雷数.现有如图所示的
方格阵,有4个方格已经被点开,则图中地雷数的可能取值有______ 种;若已知图中共有7个地雷,则它们的排列方式有______ 种.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954253b16a82489bb0e152543428c68a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/10d64ce3-d3a8-4fe8-9a73-b6912d1efaee.png?resizew=137)
您最近一年使用:0次
20-21高二·江苏·课后作业
3 . 利用组合数的性质进行计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9f09970ad96b3ab0bb14f57aaa373d.png)
______ ;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a32012801277ece866fd362065dffb.png)
______ .
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9f09970ad96b3ab0bb14f57aaa373d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a32012801277ece866fd362065dffb.png)
您最近一年使用:0次
2021-12-06更新
|
393次组卷
|
3卷引用:7.3组合
4 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ed438cff54f6f775070ed5ebae4b15.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92c7c68c6e27210517b1d0bedcfa945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ed438cff54f6f775070ed5ebae4b15.png)
您最近一年使用:0次
2021-12-06更新
|
400次组卷
|
4卷引用:7.3组合
(已下线)7.3组合苏教版(2019) 选修第二册 名师导学 第七章 7.3 组合(已下线)第10讲 排列与组合-【寒假自学课】2022年高二数学寒假精品课(苏教版2019选择性必修第二册)苏教版(2019)选择性必修第二册课本习题7.3 组合
名校
5 . 已知
且
,数列
的通项满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
______ ,记
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da8da6b610b0cf71161a4c9d6487005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ceb195fd15dcd821944641e980eb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9bbe98100c8067ff36ac536d043a85.png)
![](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/adf14ebc775db2414a5a960badca8960.png)
您最近一年使用:0次
2021-11-26更新
|
273次组卷
|
2卷引用:浙江省9+1高中联盟2021-2022学年高三上学期期中联考数学试题
6 . 在杨辉三角中,它的开头几行如图所示,则第12行中各数和为______ ,第______ 行会出现三个相邻的数的比为3:4:5.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/9b1d2ca9-42db-4b67-9eb0-6197f363324e.png?resizew=166)
您最近一年使用:0次
2021-09-22更新
|
218次组卷
|
3卷引用:人教B版(2019) 选修第二册 突围者 第三章 第二节 二项式定理与杨辉三角
7 . 计算:(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90cb3171da36a80500b3b549669ac1a.png)
______ .
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9c99089096177dc20fbe4900a7af68.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90cb3171da36a80500b3b549669ac1a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9c99089096177dc20fbe4900a7af68.png)
您最近一年使用:0次
8 . 已知
,则m=___________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c17c5ea6c3f63942214207cb9905e22.png)
___________ (用数字作答)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e371574a6e2ce423d01692ac7145e187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c17c5ea6c3f63942214207cb9905e22.png)
您最近一年使用:0次
9 . 计算(结果用数字表示)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62d1e7171a81e968bbad4f64f25fc1f.png)
___________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b0b0187a9f36bb6457582868a00163.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62d1e7171a81e968bbad4f64f25fc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b0b0187a9f36bb6457582868a00163.png)
您最近一年使用:0次
20-21高二下·浙江·期末
10 . (1)从集合
中任取两个不同的
,则
的概率为________ .
(2)设随机变量
服从二项分布
,则函数
存在零点的概率是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f736c993add01e9969f765dc0ff6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef91cfaf88e078fd8a43c0add81f087c.png)
(2)设随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c9af3c40efa8d2a672b76b84c6d686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d03c2f88697b1d9931349552c4d4d741.png)
您最近一年使用:0次