设随机变量X,Y相互独立,概率密度分别为fX(x)={-x,x>0;{0,其他.=fY(y)={e-y,y>0;{0,其他.则二维随机变量(X,Y)的联合概率密度为_____.
f(x,y)= {e-(x+y),x>0,y>0 {0,其他.
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