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解题方法
1 . 若随机变量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0b401fd2785b721df7a206ede37e97.png)
____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efa4ce18f55df1507d6acee7f13736a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb768dc982a1e6907beaedb57143755f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0b401fd2785b721df7a206ede37e97.png)
您最近一年使用:0次
2022-03-29更新
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210次组卷
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2卷引用:甘肃省天水市第一中学2021-2022学年高二下学期第一阶段考试数学(理)试题