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A.1 B. C.-2 D.2
已知数列的前n项和为,且,则等于( )
A.4 B.2 C.1 D.-2
已知数列{an}满足a1=1,a2=1,an+1=|an-an-1|(n≥2),则该数列前2011项的和S2011等于( )
A.1341 B.669 C.1340 D.1339
已知数列满足:,,用表示不超过的最大整数,则的值等于( )
A.0 B.1 C.2 D.3
已知数列{ an }满足a1=,且对任意的正整数m,n,都有am+n= am + an,则等于( )
A. B. C. D.2