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【简答题】
已知随机变量(X1，X2，X3)的协方差矩阵为 设Y1=2X1+3X2+X3，Y2=X1一2X2+5X3，Y3=X2一X3，求(Y1，Y2，Y3)的协方差矩阵C*．
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举一反三
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【单选题】Paul _____ his tour to Canada. [ ]
A.
isn't like
B.
don't like
C.
doesn't like
D.
doesn't likes
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【简答题】以下哪些因素会引起潮汐预报值与实际值相差较大:A. 寒潮 B. 台风 C. A.B都是 D. A.B都不是
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【单选题】Paul _____ his tour to Canada. [ ]
A.
isn't like
B.
don't like
C.
doesn't like
D.
doesn't likes
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