• 2022-06-25
    ‎设二维随机变量(X,Y)的联合分布函数为[img=367x51]17de684b0babac3.png[/img]则常数A=_____。‌
    未知类型:{'options': ['1/π', '1/[img=18x22]17de684b1ca4f75.png[/img]', '4/π', '4/[img=18x22]17de684b1ca4f75.png[/img]'], 'type': 102}