设D(X)=25,D(Y)=36,,则D(X+Y)=( )/ananas/latex/p/215845
设D(X)=25,D(Y)=36,,则D(X+Y)=( )/ananas/latex/p/215845
设D(X)=25,D(Y)=36,,则D(X Y)=( )/ananas/latex/p/215845
设D(X)=25,D(Y)=36,,则D(X Y)=( )/ananas/latex/p/215845
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