设数列{an}中,an=(n≥2,n∈N*),(1)若bn=(n∈N*),求bn;(2)若Sn=b1+b2+-+bn,求Sn;(3)求an.——青夏教育精英家教网——

设数列{a_n}中,a_n=(n≥2,n∈N^*),

(1)若b_n=(n∈N^*),求b_n;

(2)若S_n=b₁+b₂+…+b_n,求S_n;

(3)求a_n.

若f(x)为多项式,且=1,且=5,求f(x).

求［(+3)²-x(+2)³］.

若(2n-)=1,则k=___________.

数列{a_n}的前n项和为S_n,a_n=,则S_n=___________.

已知则f(x)的值为

A.不存在 B.-1 C.1 D.2

A.0 B.1 C.-1 D.不存在

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