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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
A.satisfy its needB.have its useC.tit its purposeD.adapt to request
A. satisfy its need
B. have its use
C. tit its purpose
D. adapt to request
A.is key toB.is similar toC.is inferior toD.are parallel to
A. is key to
B. is similar to
C. is inferior to
D. are parallel to
A.withB.fromC.throughD.into
A. with
B. from
C. through
D. into