—You look unhappy . What's wrong ?—I find ____ difficult ______on well with my classmates
A:it; to get
B:it ; getting
C:that ; to get
D:that ; getting
下列加横线字注音有误的一项是( )
数列{an}的各项均为正数,Sn为其前n项和,对于任意n∈N*,总有an,Sn,an2成等差数列.
(1)求数列{an}的通项公式;
(2)设bn=1an2,数列{bn}的前n项和为Tn,求证:Tn>nn+1.