题目内容
试题答案
等比数列的前n项和为,且4,2,成等差数列。若=1,则=
(A)7 (B)8 (3)15 (4)16
等比数列的前n项和为,且4,2,成等差数列。若=1,则=( )
A.7 B.8 C.15 D.16
等比数列的前n项和为,且4,2,成等差数列。若=1,则=( )
A.16 B.15 C.8 D.7
等比数列的前n项和为,且4,2,成等差数列.若=1,
则=__________.