a1=5,a(n+1)=2an,求它的{an}的前5项

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a1=5,a(n+1)=2an,求它的{an}的前5项a1=5,a(n+1)=2an,求它的{an}的前5项a1=5,a(n+1)=2an,求它的{an}的前5项当n=1时,a2=2a1=10;当n=

a1=5,a(n+1)=2an,求它的{an}的前5项
a1=5,a(n+1)=2an,求它的{an}的前5项

a1=5,a(n+1)=2an,求它的{an}的前5项
当n=1时,a2=2a1=10;当n=2时,a3=2a2=20;当n=3时,a4=2a3=40;当n=4时,a5=2a4=80.