等比数列{an}中,a1a9=256,a4+a6=40,则公比q为?

等比数列{an}中,a1a9=256,a4+a6=40,则公比q为? 已知等比数列an中,a3+a7=20,a1a9=64,求an 已知等比数列an中,a3+a7=20,a1a9=64,求an 在等比数列{an}中,若a3+a4+a6+a7=81,则a1a9的值为 等比数列{an}中,如果a3*a4*a6*a7=81,则a1a9的值为急 已知{an}是等比数列,且a1a9=64,a3+a7=20,求a11 . {an}为等比数列,且a1a9=64,a3+a7=20,求a11 数列an是等比数列,a3+a7=20,a1a9=64,求a5的值 {an}为等比数列,且a1a9=64a3+a7=20,求a11 等比数列an中,若an大于0,a1a9＝64,a4＋a6＝20,则an＝? 一道数列题,求简便算法!等比数列An 中 a1a9=64.a3+a7=20 ,则a11=64或1,怎么算 {an}为等比数列,且a1a9=64,a3+a7=20,求a11是多少?64或1 1.已知递增的等比数列{an}中,a1a9=2304,a4+a6=120,求an的通项公式.2.设等比数列{an}的前n项和为Sn,若S3+S6=2S9,求数列的公比q 等比数列,a1a9=64,a3十a7=20,则a11=, 已知数列为等比数列,且a1a9=64,a3+a7=20,求a11 等比数列求通项~数列{an}中,a1=1,a(n+1)=3an+n求通项 等比数列中a(n+1)+an=9*2^n-1,求an 在等比数列{an}中,a1+a6=33,a3a4=32,an+1在等比数列{an}中,a1+a6=33,a3a4=32,a(n+1)