若数列{an}满足:a1=1,an+1=2an(n属于N*),则a5=(),前8项的和s8=()
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若数列{an}满足:a1=1,an+1=2an(n属于N*),则a5=(),前8项的和s8=()
若数列{an}满足:a1=1,an+1=2an(n属于N*),则a5=(),前8项的和s8=()
若数列{an}满足:a1=1,an+1=2an(n属于N*),则a5=(),前8项的和s8=()
等比数列:an 1/an=2,则an=(a1)(2)^(n-1)
a5=2^4=16
Sn=a1(1-q^n)/(1-q)
则S8=255
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