若等比数列an满足a1=8,a2a3=-8,则a3+a4等于
3个回答
a2a3
=a1q*a1q^2
=a1^2q^3=-8
q^3=-8/8^2=-1/8
q=-1/2
则 a3+a4=a1q^2+a1q^3=2-1=1
相关问题
若等比数列{an}满足a4+a8=-3,则a6(a2+2a6+a10)=( )
若等比数列{an}满足a4+a8=-3,则a6(a2+2a6+a10)=( )
已知等比数列an满足a1+a2+a3=1,a4+a5+a6等于8,则a2+a3+a4=
(2014•泉州一模)若等比数列{an}满足a6a8-4a7=0,则a1•a2•a3•…•a13等于( )
数列{an}是等比数列,若a1+a2+a3= - 3,a1a2a3=8,则an=?
等比数列an中,a1=1,a3=2a2,则a8等于
等比数列an中,a1=1,a3=2a2,则a8等于
等比数列求解 等比数列An 若A1+A2+A3=7 A1A2A3=8 求AN
{an}为等比数列,若a8/a4=2,S4=4,则S8等于
已知等比数列{an}满足a1+a2+a3=1,a4+a5+a6=-8,则{an}的公比q为