若数列{an}满足1a
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若数列{an}满足
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a
由题意知:
∵数列{ 1 xn}为调和数列 ∴ 1 1 xn+1− 1 1 xn=xn+1−xn=d ∴{xn}是等差数列 又∵x1+x2+…+x20=200= 20(x1+x20) 2 ∴x1+x20=20 又∵x1+x20=x5+x16 ∴x5+x16=20 故答案为20.
若数列{an}满足1a
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