题目

设等差数列{an}的前n项和是Sn,且a4+a8=0,则A.S4＜S5                         B.S4=S5                       C.S6＜S5                       D.S6=S5 答案：D解:∵{an}是等差数列,∴2a6=a4+a8=0.∴a6=0.∴S5=S6.应选D.

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