若{an}是等比数列,其公比是q,且-a5,a4,a6成等差数列,则q等于( )
若{an}是等比数列,其公比是q,且-a5,a4,a6成等差数列,则q等于( )
若an是等比数列,其公比是q,且 -a5,a4,a6成等差数列,则q等于()
{an}是公比为q的等比数列,且-a5,a4,a6成等差数列,则q=
已知an是公比为实数q的等比数列,若a4,a5+a7,a6成等差数列,则q等于?
若等比数列AN的公比q不等于1.,且a3,a5,a4成等差数列,求(a3+a5)/(a4+a6)
已知{an}是公比为q的等比数列,若a7=1,且a4,a5+1,a6成等差数列,则实数q= ___ .
已知{an}是公比为常数q的等比数列,若a4,a5+a7,a6成等差数列,则q等于 ______.
⒈正项等比数列{an}的公比q≠1,且a3,a5,a6成等差数列.则(a3+a5)/(a4+a6)=?
各项都是正数的等比数列An的公比q不等于1,且a3,a5,a6成等差数列,则(a3+a5)/(a4+a6)=?
已知各项都为正数的等比数列,{an}的公比q≠1,且a4,a6,a7成等差数列,则a4+a6a5+a7的值等于:( )
等差数列{an}中,若公差d≠0,且a2、a3、a6成等比数列,则公比q等于( )
已知等比数列{an}的公比q=-13,则a1+a3+a5+a7a2+a4+a6+a8等于( )