1951 AMC 12 第 13 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。
13.
可在 天内完成一项工作。 的效率比 高 。 完成同一项工作所需的天数为：
can do a piece of work in days. is more efficient than The number of days it takes to do the same piece of work is:
以上答案均不正确
None of these answers
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