1961 AMC 12 第 26 题
先试着解答 1961 AMC 12 第 26 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 1961 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。
26.
某等差数列的前 项之和为 ，接下来的 项之和为 。该数列的首项为：
For a given arithmetic series the sum of the first terms is and the sum of the next terms is The first term in the series is:
其他年份的第 26 题
- 1950 AMC 12
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- 1953 AMC 12
- 1954 AMC 12
- 1955 AMC 12
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- 1957 AMC 12
- 1958 AMC 12
- 1959 AMC 12
- 1960 AMC 12
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- 1963 AMC 12
- 1964 AMC 12
- 1965 AMC 12
- 1966 AMC 12
- 1967 AMC 12
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- 1969 AMC 12
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- 1971 AMC 12
- 1972 AMC 12
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