17.(本小题满分12分)已知单调递增的等差数列{@.}的前项和为S.,S,一40,a1,a:一1,a成等比数列,正项等比数列{6,}满足b=a1十1,S=26,十3.
(1)求{a.)与{6,》的通项公式:
(2)设6.=a,(2+3引og,,求数列c的前n项和T…