高中数学题求助,快~已知:数列{an}满足a1+2a2+2&su

已知:数列{an}满足a1+2a2+2²a3+……+[2^(n-1)]*an=n/2(n∈N+). (1)求数列{an}的通项. (2)若bn=n/an,求数列{bn}的前n项和Sn.高中数学题求助,快~已知:数列{an}满足a1+2a2+2²a3+……+[2^(n-1)]*an=n/2(n∈N+).(1)求数列{an}的通项.(2?