1994 AMC 12 第 6 题
先试着解答 1994 AMC 12 第 6 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1994 AMC 12 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
6.
数列 中的每一项都是它左边两项之和。求 。
In the sequence each term is the sum of the two terms to its left. Find
答案：A
小提示：
用已知项减去它前面的一项，逐项向前推
Work backward by subtracting the preceding known term
大提示：
先依次求出 ，再求
Determine in that order before finding
解答：
向前推算，由 得 ，再由 得 ，由 得 。最后 ，所以 。因此正确答案是 A。
Working backward, gives then gives and gives Finally so Thus the correct answer is A.
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