1.设Qn=n/3
Qn+1=(n+1)/3
Qn+1-Qn=3^n*an+1=1/3
an+1=1/3^(n+1)
an=1/3^n
2.bn=n*3^n
设数列an满足a1+3a2+3²a3……+3n-1次方an=n/3
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