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週期數列:a1=0 a2=i a3=i-1 a4=-i a5=i-1 a6=-i.看出規律沒,後面所有項是i-1和-i的交替.所以2007項和為2i-1003.怎麼不是常數,可能是你抄錯題或者我算錯了.反正方法是多寫幾項,找週期
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