若数列{an}满足a1=1,a(n+1)=2an(n∈N+),则a5=?,前8项和S8=?^
1.若数列an满足:a1=1,a(n+1)=2an(n∈N+),则a5=?前8项的和S8=?
若数列an满足:a1=1,Sn-1=2an+Sn(n∈N+),求an前8项和S8
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