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根據題意得出這樣的規律: n÷4餘數為2時,這個數是-1/n,否則為1/n 於是 50÷4=12餘數為2,所以第五十個數是-1/50 2013÷4=503餘數為1,不是2,所以第2013個數是1/2013
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