设随机变量,则=_____________.(请写成小数格式)/ananas/latex/p/1904956/ananas/latex/p/801636
设随机变量,则=_____________.(请写成小数格式)/ananas/latex/p/1904956/ananas/latex/p/801636
1
设随机变量,则=_____________.(请写成小数格式)/ananas/latex/p/1904956/ananas/latex/p/801636