一道GRE数学题,求详解Acertainscholarshipcommitteeawardedscholarshipsintheamountsof$1,250,$2,500,and$4,000.Thecommitteeawardedtwiceasmany$2,500scholarshipsas$4,000scholarships,anditawardedthreetimesasmany$1,250schol
设随机变量X1,X2,X3独立同分布,且Xi(i=1,2,3)的分布列为:P(Xi=k)=1/3(k=1,2,3),求Y=max{X1,X2,X3}的数学期望
【高中化学下列各组溶液互相反应鉴别问题下列各组溶液,只用组内溶液互相反应的方法就可鉴别(AD)A,NaOH,NaCl,FeCl3,MgCl2B,Na2SO4,BaCl2,KNO3,NaClC,NaCl,AgNO3,NaNO3,HClD,NaSO4,Na2CO3,BaCl2,HCl】
高三数列综合题已知函数f(x)=x²+x-1,α,β是方程f(x)=0的两个根(α>β),f'(x)是f(x)的导数,设a1=1,a(n+1)=an-[f(an)/f'(an)](n=1,2,.)(1)求α,β的值(2)已知对任意的正整数n,有an>α,记bn=ln[(an-β)/(an-α)](n=1,2,..