2Sm0Sm13的精选

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 设等差数列的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=    . 

 设等差数列的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=    . 

2020-06-03
问题详情: 设等差数列的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=. 【回答】5知识点:数列题型:填空题...
设等差数列{an}的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=(  )A.3      ...

设等差数列{an}的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=(  )A.3      ...

2020-05-13
问题详情:设等差数列{an}的前n项和为Sn,若Sm-1=-2,Sm=0,Sm+1=3,则m=()A.3              B.4           C.5           D.6【回答】C解析∵Sm-1=-2,Sm=0,Sm+1=3,∴am=Sm-Sm-1=0-(-...