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解题方法
1 . 若随机变量
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07dbcc589f0ba0bf2bb9a63370b5dc9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18805128163bfba16539a0364efdb706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ff0e46c6dd59884f052cbfcba619ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07dbcc589f0ba0bf2bb9a63370b5dc9.png)
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2022-05-11更新
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679次组卷
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3卷引用:四川省宜宾市2022届高三下学期第三次诊断测试数学(理)试题