1952 AMC 12 第 30 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
30.
若一个等差数列前十项之和是前五项之和的四倍，则首项与公差之比为：
When the sum of the first ten terms of an arithmetic progression is four times the sum of the first five terms, the ratio of the first term to the common difference is:
其他年份的第 30 题
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