题目内容

设F1(x)与F2(x)分别为随机变量，X1与X2的分布函数，为便F(x)＝aF1(x)－bF2(x)是某一随机变量的分布函数，在下列给定的各组数值中应取()．

A. a＝3／5，b＝﹣2／5
B. a＝2／3，b＝2／3
C. a＝﹣1／2，b＝3／2
D. a＝1／2，b＝﹣3／2

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