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單項是2/3 2/5 2/7分子都是2,分母奇數排列是3 5 7 9 11 . 雙項是1/2 1/3 1/4分子都是1,分母依次為2 3 4 5 6 . 如果繼續填應該是2/3 1/2 2/5 1/3 2/7 1/4 2/9 1/5 2/11 1/6.
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