设随机变量X,Y相互独立,D(X)=4D(Y),令U=3X+2Y,V=3X-2Y,则=_______.
考试:国家电网招聘
科目:其他工学类 (电网)(在线考试)
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设随机变量X,Y相互独立,D(X)=4D(Y),令U=3X+2Y,V=3X-2Y,则=_______.
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