设bn=1/an,把原等式乘以1/(ana(n-1))则bn-b(n-1)=3,bn=b2+(n-2)*3,(n>=2)且b1=1,得到an=1/(3n-2)
在数列{an}中,若a1=1,3anan-1(注:n-1是整体)+an-an-1(注:n-1是整体)=0(n大于等于2,
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