设.则M-N等于 A.{4.5.6.7.8.9.10} B.{7.8} C.{4.5.6.9.10} D.{4.5.6} 查看更多

 

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,则M-N等于

A.{4,5,6,7,8,9,10}                          B.{7,8}

C.{4,5,6,9,10}                                     D.{4,5,6}

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设等差数列{an}的前n项和为SnSm1=-2Sm0Sm13,则m等于(  )

A3 B4 C5 D6

 

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设等差数列{an}的前n项和为SnSm1=-2Sm0

Sm13,则m等于(  )

A3 B4 C5 D6

 

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

A.3 B.4 C.5 D.6

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