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(Pattern & Cycle + Number Sequence) In a number sequence, $$a_{1}$$ = -1, $$a_{2}$$ = 1,$$a_{n}$$ = $$a_{n-1}$$ – $$a_{n-2}$$ and $$n\geq 3$$. What is the sum of the first 1,000 terms?
答案：3.0

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老师这一题要怎么做啊

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