第17周第1课时-随机变量的数字特征（2）.mp4

简介: 第17周第1课时-随机变量的数字特征（2）.mp4
更新时间: 2020-06-08 11:15:13
资源地址: http://ft.zypt.hdjky.org.cn/cms-ft/open/product/download/PD990212641203290112

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