等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为

来源：学生作业帮助网编辑：作业帮时间：2024/05/02 09:45:44

$等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为$

等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为
等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为

等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为
因为a3^2=a1*a9
所以a3^2=(a3-2d)(a3+6d)
d=3a3
a1+a3+a9/a2+a4+a10=a3+2a5/a4+2a6
=a3+2(a3+2d)/a3+d+2(a3+3d)
=a3+2*7a3/a3+2*10a3
=15a3/21a3
=5/7

a3^2=a1a9
(a1+2d)^2=a1(a1+8d)
4d^2=4da1
d=a1
(a1+a3+a9)/(a2+a4+a10)
=(a1+a1+2d+a1+8d)/(a1+d+a1+3d+a1+9d)
=(3a1+10d)/(3a1+13d)
=(3a1+10a1)/(3a1+13a1)
=13/16

已知等差数列{an}的公差d不等于0且a1,a3,a9成等比数列,则看图已知{an}为等差数列,公差d不等于0,且a1、a2、a3成等比数列,则求/RT题目有错，抱歉了，已知{an}为等差数列，公差d不等于0，且a1、a2、a3成等比数列，则求/的值已知等差数列an的公差d不等于0 在等差数列{an}中,公差d不等于0,且a1a3a7成等比数列,则a1+a3/a2+a4的值为? 若等差数列｛AN｝的公差D不等于0 且A1,A3,A7成等比数列,A1分之A2等于已知等差数列[AN]的公差D不等于0,若A3,A9,A15成等比数列,那么公比为? {an}是等差数列,公差d不等于0,a2,a3,a6成等比数列,则公比为? 若an是等差数列,公差d不等于0,a2,a3,a6成等比数列,则公比为? 已知{an}是等差数列,公差d不等于0 a2,a3,a6成等比数列,则公比为? 等差数列an,公差d不等于0,a1 a3 a4 等比求(a1+a3+a9)/(a2+a4+a10) 已知等差数列{an}的公差d不等于0,且a1,a3,a9成等比数列,则(a1+a3+a9)/(a2+a4+a10)的值是等差数列{an}的公差为d不等于0,且a1,a3,a9成等比数列,求a1+a3+a9/a2+a4+a10的值. 要详解答案! 等差数列{an}的公差d不等于0,a3^2=a1a9,则a1+a3+a9/a2+a4+a10的值为等差数列｛an｝的公差d不等于0,又有a1、a3、a9成等比数列,则（a2+a4+a8）/(a1+a3+a9)的值为? 等差数列an中,公差为d（不等于0）,且a1,a3,a9成等比数列,则（a1+a3+a9)/(a2+a4+a9)的值为已知等差数列{an}的公差d不等于0且a1,a3,a9成等比数列,则(a1+a2+a3)/(a2+a4+a10)等于多少? 已知等差数列｛an｝的公差d不等于0,且a1,a3,a9成等比数列,则（a1+a3+a9）/(a2+a4+a10)=? 已知等差数列｛an｝的公差d不等于0,且a1,a3,a9成等比数列,则(a1+a3+a9)/(a2+a4+a10)=?