若数列{an}为等比数列,且an>0,则数列{lgan}是什么数列
{lgan}是等比数列,则{an}是什么数列?
已知数列{an},则“数列{an}为等比数列”是“数列{lgan}为等差数列”的______条件 (填写:充分
若数列{an}是公比为q的等比数列,且bn=lgan,求证{bn}为等差数列
“数列{an}是各项为正的等比数列”是“数列{lgan}是等差数列”的_____条件
已知命题:“若数列{an}是等比数列,且an>0,则数列b
已知数列{lgAn}是等差数列,求证{An}是等比数列
设正数数列{an}为一等比数列,且a2=4,a4=16,求lim(lgan+1+lgan+2+...+lga2n)/n^
已知数列{lgan}是首项为3,公差为2的等差数列,求证:{an}是等比数列.
数列{an}、{bn}分别为正项等比数列,Tn,Rn分别是数列{lgan}{lgbn}的前n项和,且Tn/Rn=n/2n
设数列{an}是各项为正等比数列 求证数列{lgan}为等差数列,并写出首项和公差
若数列{an},则有数列bn=a1+a2+a3+**an/n也为等差数列,数列{an}是等比数列,且cn>0,则有dn=
已知等比数列{an}中,a1=1,a4=81,若数列{bn}满足bn=lgan/lg3,则数列{1/bnbn+1}的前n