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已知D(X)=2，D(Y)=3，则Cov(X+Y，X-Y)等于().
分类: 数学2 (军队文职)
发布时间: 2023-11-03 09:28
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已知D(X)=2，D(Y)=3，则Cov(X+Y，X-Y)等于().
A.1
B.-1
C.5
D.6
正确答案是B
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