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第1题

[填空题,5分] He is very clever and his ability to improve his work is very （limit）.
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第2题

[填空题,5分] This is a (confuse) word because it has two meanings. confusing
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第3题

[填空题,5分] He earned 1,000 dollars in (add) to his salary.
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第4题

设随机变量X1,X2的概率密度分别为f1(x)= 2 e x > f ( x ) = 0 x≤0 x≤0 求(1)E(X1+x2),E(2x1-3);(2)又设x1,X2相互独立,求E(X1X2)
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