【单选题】已知 为等比数列 的前 项和, ,若数列 也是等比数列,则 等于 ( )
【单选题】若等比数列 中, ,若 , ,则 等于( )
【多选题】Picasso and his paintings can be evaluated asfollows:_______________.
A.
Picasso is one of the representatives of realism in western art history.
B.
Picasso is famous for his Cubist painting.
C.
Picasso’s painting is abstract for us to understand.
D.
Picasso’s paintings are unacceptable by the art circle.
E.
Picasso and his paintings are quite influential and well-accepted.
【简答题】等比数列 的前n项和为 ,若 ,则 等于 。
【多选题】下列属于我国公民的基本义务范畴的有( )。
【简答题】若等比数列 的首项为 ,且 ,则公比等于 。
【简答题】各项均为正数的等比数列 的前 项和为 ,若 , ,则 等于 .