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设数列{xn}满足logaxn+1=1+logaxn,且x1+x2+…+x100=100,x101+x102+…+x200的值为()A.100aB.101a2C.101a100D.100a100

题目详情
设数列{ xn}满足logaxn+1=1+logaxn,且x1+x2+…+x100=100,x101+x102+…+x200的值为(  )
A. 100a
B. 101a2
C. 101a100
D. 100a100
▼优质解答
答案和解析
∵logaxn+1=1+logaxn,∴logaxn+1-logaxn=1,
log
xn+1
xn
a
=1,则
xn+1
xn
=a,
∴数列{xn}是以a为公比的等比数列,
∵x1+x2+…+x100=100,∴x101+x102+…+x200=a100x1+a100x2+…a100x100
=a100(x1+x2+…+x100)=100a100
故选D.