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A.-3 B.-11
C.-5 D.19
在数列{an}中,a1=2,a2=5,且an+1=an+2+an,则a6的值为( )
A.-3 B.-11? C.-5 D.19
在数列{an}中,an+1=an+2+an,a1=2,a2=5,则a6的值为