A:This is the hall. It is small and dirty.
B:This is the hall. It is big and clean.
已知全集U=R,集合A=x|3x>1,B=x|log2x>0,则A∪B=( )
利用计算机产生0,1之间的均匀随机数a1=rand,经过下列的那种变换能得到﹣2,3之间的均匀随机数( )