设随机变量XY的概率密度为f(x,y)=be^[-(x+y)],0
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设随机变量XY的概率密度为f(x,y)=be^[-(x+y)],0
∫∫be^[-(x+y)]dxdy=1,可得b=e/(e-1)
f(x)=∫be^[-(x+y)]dy=be^(-x),0
f(x)=∫be^[-(x+y)]dy=be^(-x),0
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