设等比数列an的公比q=2,前n项和为sn,则s4\a2=

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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\a2=S4=a1(1-2^4)/

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\a2=
S4=a1(1-2^4)/(1-2)=15a1
a2=a1·q=2a1
S4/a2=15a1/(2a1)=15/2=7.5