2026 AMC 8 第 18 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。
18.
有多少种方法可以把 写成两个或更多个连续正奇数的和,并且这些奇数按递增顺序排列?
In how many ways can be written as the sum of two or more consecutive odd positive integers that are arranged in increasing order?
小提示:
若有若干项,可以写成 。
Write the terms as
大提示:
这些数的和是 ,所以 必须整除 。
Their sum is , so must divide
视频讲解:
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文字解答:
假设有 项,首项为正奇整数 。它们的和为 。检查 为 的因数的情况,可行情况为 和 ,分别给出 和 。所以共有 种方法。
Suppose there are terms, starting with odd positive integer . The sum is . Testing divisors of , the positive odd starts occur for , giving , and for , giving . Thus there are ways.
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