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【简答题】
设二维随机变量(X，Y)服从在A上的均匀分布，其中A为x轴、y轴及直线x+y+1=0所围成的区域，求：(1)E(X)；(2)E(-3X+2Y); (3)E(XY)的值．
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举一反三
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A.
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B.
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A.
delete from tb_name
B.
delete from sample.tb_name
C.
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D.
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A.
正确
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to play
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to play with
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to be played
D.
to be played with
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