(1)在Sn=1/2an*an+1令n=1得a2=2
an+1=Sn+1一Sn=1/2an+1*an+2一1/2an*an+1,得2=an+2一an,分奇偶项讨论知an=n
(2)bk+1/bk是(bk+1)/bk还是bk+(1/bk)?
k-p/ak+1是k-(p/(ak+1))还是(k-p)/(ak+1)还是k-(p/ak)+1?
(1)在Sn=1/2an*an+1令n=1得a2=2
an+1=Sn+1一Sn=1/2an+1*an+2一1/2an*an+1,得2=an+2一an,分奇偶项讨论知an=n
(2)bk+1/bk是(bk+1)/bk还是bk+(1/bk)?
k-p/ak+1是k-(p/(ak+1))还是(k-p)/(ak+1)还是k-(p/ak)+1?