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数列{xn}满足,则xn等于 ( )
A. B. C. D.
数列{xn}满足,且x1+x2+…+xn=6,则首项x1等于
2n-1
n2
数列{xn}满足x1=1,x2=,且+=(n≥2),则xn等于
()n-1
()n