(α>0,β>0).若f`(x)在 x=0 处连续,则-|||-(A) alpha -beta gt 1. (B) lt alpha -beta leqslant 1.-|||-(C) alpha -beta gt 2. (D) lt alpha -beta leqslant 2.

15.设总体X的分布函数为-|||-(x;beta )= ^beta ), xgt alpha , 0, xleqslant alpha , .-||

当 x arrow 0 时, alpha(x), beta(x) 是非零无穷小量, 现有以下四个命题:(1) 若 alpha(x) sim beta(x), 则

(2)设总体X的概率密度为f(x; alpha, beta )=}alpha, & -1<0, beta , & 0le x<1, 0, &am

alpha =(1,a,0), beta =(-1,2,b), 欲使 alpha +beta =0, 则 ()-|||-A、 =2, b=0 B、 a=-2 b

1.“sin^2 alpha +sin^2 beta =1”是“sin alpha +cos beta =0”的（）.A. 充分非必要条件B. 必要非充分条件C

当 x arrow 0 时, alpha(x), beta(x) 是非零无穷小量, 给出以下四个命题:① 若 alpha(x) sim beta(x), 则 a

若随机变量 X sim N(0,1)，且 PX > x = alpha in (0,1)，则 x = ()A. $\Phi^{-1} \left(1 - \f

1 设 -|||-A、 α,β.-|||-B、 α,β,y:-|||-C、 alpha +beta ;-|||-D、 alpha -beta ;

设向量0 1 2-|||-(alpha )_(1)= 1 _(2)= 1 ,beta = 1-|||--1 1 3，则0 1 2-|||-(alpha )_(1

,n, 则 ((y)_(1))=-|||-A.β0 B.β1x C. beta in (beta )_(1)(x)_(1) D. (beta )_(9)+(be