数列{an},a(n+2)=1/(an+1),a100=a98,a15+a16=?
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a100=1/a99

a100=a98

a98=a99=a100=1或-1

a98=1/a97

a97=1或-1

以此类推

a1=a2=a3=...=a98=a99=a100=1或-1

a15+a16=2或-2

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