设随机变量X服从[1,5]上的均匀分布,Y服从参数为3的指数分布,且X,Y相互独立。求:(1)X的概率密度fx(x)和Y的概率密度fy(y);(2)(X,Y)的概率密度f(x,y);(3)E(X-2Y),D(X-2Y)。
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