设二维随机变量(X,Y)的概率密度为f(x,y)={e^-y,0<x<y;0,其他.}求Z=X+Y
设二维随机变量(X,Y)的概率密度为f(x,y)={e^-y,0<x<y;0,其他.}求Z=X+Y
日期:2014-11-23 23:39:11 人气:1
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f(X,Y)关于X的