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你好: 0,4,16,40,80,(140) 觀察數位規律性平緩遞增,著重考慮前項减後項. 前項减後項的出新數列: 4,12,24,40; 無明顯規律,且各項數位仍然為平緩遞增,仍然考慮前項减後項. 前項减後項的新數列: 8,12,16,即公差為4的等差數列,下一項應為20,還原為: 4,12,24,40;20+40=60; 再次還原:0 4 16 40 80,80+60=140.
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