设等比数列｛an｝的公比q=1/2,前n项的和为Sn,则S4/a4=?

设等比数列an的公比为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=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,则S4/a4= 设等比数列{an}的公比q=2,前n项和为Sn,S4\a2 设等比数列{an}的公比q=2,前n项和为Sn,则S4/a2=? 设等比数列an的公比q=2,前n项和为sn,则s4\a2= 设等比数列an的公比q=2,前n项和为sn,则s4除以a2= 设等比数列{an}的公比q=2,前n项和为Sn,则S4/a2等于 设等比数列{an}的公比q=2,前n项和为Sn,则S4/a2等于（ ）