已知等比数列an前n项和为Sn,若s2=1,s4=4,则公比q=
已知等比数列{an}前n项和为sn,且s4/s2=15/2,则公比q等于
设等比数列{an}的公比q=2,前n项和为Sn,则S4/S2等于
设等比数列an的公比为q=1/2,前n项和为Sn,则S4/a4=?
已知{An}是首项为a1,公比为q,(q不等于1,大于0)的等比数列,前n项和为Sn,5*S2=4*S4,设Bn=q+S
设等比数列{an}的公比q=1/2,前n项和为Sn,则S4/a4=
设等比数列an的公比q=1/2,前n项和为sn,则s4/a4=
设等比数列{an}的公比q=1/2,前n项和为Sn,则S4/a4=?
设等比数列an的公比q=1/2,前n项和为Sn,则S4/a4
设等比数列{an}的公比q=2,前n项和为Sn,S4\a2
等比数列an的公比为1/3,前n项和为Sn,n属于正整数.如S2,S4-S2,S6-S4成等比数列.则其公比为
若Sn是公比为q的等比数列{an}的前n项和,且S4,S6,S5成等差数列,则公比q=______.
设等比数列an的公比q=2,前n项和为Sn,则S4/a4=