(1)∵数列{an}中,a1=1,an+1=
,(n∈N*)an
an+3
∴
=1 an+1
=
an+3 an
+1,3 an
∴
+1 an+1
=3(1 2
+1 an
),1 2
∴
+1 an+1
=(1 2
+1 a1
)?3n-1=1 2
.3n 2
∴an=
.(4分)2
3n?1?1
(2)∵
,bn=(3n-1)2
3n?1?1
an,n 2n
∴bn=(3n?1)?
?n 2n
=n?(2
3n?1
)n?1,1 2
∴Tn=1?1+2?(
)+3?(1 2
)2+…+n?(1 2
)n?1,①1 2
Tn=1?1 2
+2?(1 2