题目

Roger Miller had a difficult childhood. Most of his days were spent working on his uncle’s farm, __26__ cotton. He was a lonely and unhappy child. Roger began writing songs __27__ he loved the music he heard on the radio. He also learned to play the guitar and the violin. Much __28__, he learned to play the drums. Music helped the young Roger __29__ the hard work on his uncle’s cotton farm. Roger left the farm when he was still very young. He __30__from town to town in the west. He worked at any job he could find __31__ the day. At night, he went to music __32__ and drinking places已知等差数列{an}的前n项和为Sn，且a3=10，S6=72，bn=an-30．（1）求通项an；   （2）求数列{bn}的前n项和Tn的最小值．