有關S415的精選大全

設等比數列{an}的前n項和為Sn.若S2=3,S4=15,則S6=()A.31               ...
問題詳情:設等比數列{an}的前n項和為Sn.若S2=3,S4=15,則S6=()A.31                        B.32                         C.63                     ...
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