已知数列an满足a1=1,an+1=2an +1 (n是正整数)
5个回答
a(n+1)=2an +1
a(n+1)+1=2(an +1)
so an +1为首项为2公比为2等比
an +1=2*2^(n-1)=2^n
an =2^n-1
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