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斐波拉契數列 先不要看正負 看絕對值 就是1 1 2 3 5 8 13 前兩個數位之和等於後一個數位 所以後面絕對值為21、34 符號是+ -- + -- 所以1,-1,-2,3,-5,-8,13,(-21),(-34)
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