1.已知等差数列= ( ) A.18 B.36 C.54 D.72 查看更多

 

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已知等差数列=                                   

A.18                          B.36                          C.54                          D.72 

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已知等差数列=                                   

A.18                          B.36                          C.54                          D.72 

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已知等差数列{an}的前n项和为,若,则等于      (    )

A.72           B.54           C.36           D.18

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已知等差数列的前项和为,若,则等于     ()

A.18             B.36               C.54               D.72

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已知等差数列的前n项和为,且=

A.18         B.36        C.54            D.72

 

 

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