已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn已知数列an满足a1=1,a(n+1)=an/{3(an)+1}Sn=a1a2+a2a3+......+an(an+1),求Sn
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已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn已知数列an满足a1=1,a(n+1)=an/{3(an)+1}Sn=a1a2+a2a3+......+an(an+1),求Sn
已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn
已知数列an满足a1=1,a(n+1)=an/{3(an)+1}
Sn=a1a2+a2a3+......+an(an+1),求Sn
已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn已知数列an满足a1=1,a(n+1)=an/{3(an)+1}Sn=a1a2+a2a3+......+an(an+1),求Sn
这题综合性比较强,LZ首先要能理解{1/an}是等差数列这步
求通项公式时用到了倒数法
求前n项和时用到了裂项相消法
若LZ还有什么不明白的地方可追问
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