(2008•長寧區(qū)二模)已知函數(shù)f(x)=ax+b,當x∈[a1,b1]時,值域為[a2,b2],當x∈[a2,b2]時,值域為[a3,b3],…當x∈[an-1,bn-1]時,值域為[an,bn],…其中a,b為常數(shù),a1=0,b1=1.
(1)若a=1,求數(shù)列{an}與{bn}的通項公式;
(2)若a>0,a≠1,要使數(shù)列{bn}是公比不為1的等比數(shù)列,求b的值;并求此時[a1,b1]∪[a2,b2]∪…∪[an,bn];
(3)若a>0,設數(shù)列{an}與{bn}的前n項和分別為Sn和Tn,求(T1+T2+…+T2008)-(S1+S2+…+S2008)的值.