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Gaokao Math Practice Question

3. (5 分) 我国古代数学名著《算法统宗》中有如下问题: “远看巍巍塔七层, 红光点点倍加增, 共灯三百八十一, 请问尖头几盏灯? "意思是: 一座 7 层塔 共挂了 381 或灯, 且相邻两层中的下一层灯数是上一层灯数的 2 倍, 则塔的 顶层共有灯()

  1. A.1 盏
  2. B.3 盏
  3. C.5 或
  4. D.9 或

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