单项选择题

10张奖券中含有3张中奖的奖券，每人购买1张，则前3个购买者中恰有1人中奖的概率为( )
A．C₁₀³×0.7²×0.3 B．0.3
C．0.7²×0.3 D．3×0.7²×0.3

A.C₁₀³×0.7²×0.3
B.0.3

C.0.7²×0.3
D.3×0.7²

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单项选择题

设，则du=( )．
A．2xdx-2x²dy
B．
C．
D．

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B.

C.2xdx-2x²dy

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单项选择题

判别级数的敛散性的正确方法是( )．
(A)，因为收敛，所以级数收敛
(B)，所以级数收敛
(C)，因为发散，所以级数发散
(D)，所以级数收敛

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B.

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