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一層一層搭起你的計算能力。
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First volume: full price. Second: −30%. Third and following: −50%.
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60 puzzles with solutions in a downloadable PDF collection. Edition: 繁體中文.
60題可列印數字金字塔,附解答。每塊磚的數字等於正下方兩塊磚的數字之和。PDF數位下載,不寄送實體書。
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