• 2022-06-01
    设二维连续型随机变量(X,Y)的联合密度函数为[img=294x53]180320916293fed.png[/img],则( )
    A: [img=127x43]180320916be2939.png[/img]
    B: [img=109x43]1803209174b5c61.png[/img]
    C: [img=109x43]180320917d704e5.png[/img]
    D: [img=127x43]1803209185fb86d.png[/img]