• 2022-06-01
    设二维连续型随机变量(X,Y),它的概率密度为f(x,y),则[img=67x25]18038d36ea9fdc7.png[/img]
    A: [img=116x51]18038d36f7e2795.png[/img]
    B: [img=107x50]18038d3700e1eba.png[/img]
    C: [img=114x51]18038d370890837.png[/img]
    D: [img=113x51]18038d37155f2e0.png[/img]
  • 举一反三