已知函数f(x)=x/(x+1),若数列{an}:a1=1,an+1=f(an),求{an}的通项公式,若满足{cn}=
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已知函数f(x)=x/(x+1),若数列{an}:a1=1,an+1=f(an),求{an}的通项公式,若满足{cn}=2^n/an,求{cn}前n项
![已知函数f(x)=x/(x+1),若数列{an}:a1=1,an+1=f(an),求{an}的通项公式,若满足{cn}=](/uploads/image/z/7049695-31-5.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dx%2F%28x%2B1%29%2C%E8%8B%A5%E6%95%B0%E5%88%97%7Ban%7D%EF%BC%9Aa1%3D1%2Can%2B1%3Df%28an%29%2C%E6%B1%82%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%2C%E8%8B%A5%E6%BB%A1%E8%B6%B3%7Bcn%7D%3D)
a(n+1)=an/(an+3).整理得
1/a(n+1)=3/an +1
令1/an=bn,b1=a1=1
b(n+1)=3bn+1
b(n+1)+1/2=3(bn+1/2)
令bn+1/2=Tn,T1=b1+1/2=3/2
Tn=3/2.3^(n-1)
bn=3/2.3^(n-1)-1/2
an=1/(3/2.3^(n-1)-1/2)
1/a(n+1)=3/an +1
令1/an=bn,b1=a1=1
b(n+1)=3bn+1
b(n+1)+1/2=3(bn+1/2)
令bn+1/2=Tn,T1=b1+1/2=3/2
Tn=3/2.3^(n-1)
bn=3/2.3^(n-1)-1/2
an=1/(3/2.3^(n-1)-1/2)
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