2. 外语
  3. Each number is the sum of the previous two numbers. What were the first two numbers that started the series?

Each number is the sum of the previous two numbers. What were the first two numbers that started the series?

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问题 Each number is the sum of the previous two numbers. What were the first two numbers that started the series?
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答案2.5
解析 (设19和81之间的数字为x，y，则19+x=y，x+y=81，得x=31，y=50。则后四个数分别为19，31，50，81。则前四个数从后往前可推知分别是12，7，5，2。)
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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类
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B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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