真题
解题方法
1 . A,B两个代表队进行乒乓球对抗赛,每队三名队员,A队队员是
,
,
,B队队员是
,
,
,按以往多次比赛的统计,对阵队员之间胜负的概率如下表:
现按表中对阵方式出场,每场胜队得1分,负队得0分,设
,
分别表示A队、B队最后所得总分.求:
(1)
,
的分布列;
(2)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f1eb87ce12491e171c43b238a6ecf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4450b959d69fdf09b38ba82fe132ec33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c89fcb4633216e492ed5a04cf45eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f7ea2f259572ff803b6beacbf117f.png)
对阵队员 | A队队员胜的概率 | A队队员负的概率 |
| ||
| ||
|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e120a8d46dccb9e009bc59135e71f6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0f80630c5138b83ff1793cbcf5f13c.png)
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2022-03-08更新
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5卷引用:2003 年普通高等学校招生考试数学试题(辽宁卷)
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