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後面兩個應該是(2)(7) 可以每兩個數看成是一個數位,這樣得到的是63,51,39(當然看成是6.3,5.1,3.9也可以) 這是一個等差遞減數列,63-51=12,51-39=12,下兩個數就是39-12=27
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