• 2021-04-14
    设p(x.y)为(X,Y)的联合密度函数,则等于( )。其中D由 y=2x ,x=1, y=0所围http://image.zhihuishu.com/zhs/onlineexam/ueditor/201707/eca4f0b52ee942efab1fd96aefe6a715.png