已知数列{lgan﹜是等差数列,求证﹛an﹜是等比数列.
已知数列{lgan﹜是等差数列,求证﹛an﹜是等比数列.
已知数列{lgAn}是等差数列,求证{An}是等比数列
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.
已知数列an是等比数列,a1=2,a4=16 设数列bn=lgan 求证bn是等差数列并求其前n项和
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
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}是公比为q的等比数列,且bn=lgan,求证{bn}为等差数列
{lgan}是等比数列,则{an}是什么数列?
“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
等比数列{an}中,an大于0,n属于正整数,求证{lgan}是等差数列,{根号下an}是等比数列
已知数列{an}满足:lgan=3n+5,试用定义证明{an}是等比数列 lgan=3n+5
已知数列{an}满足:lgan=3n+5,试用定义证明{an}是等比数列