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2025年12月国际B卷 · 第 5 题

2025年12月国际B卷 · 原库模块 2 · Q5 原库参考解析

A bookstore is giving away free books every day. The equation \( f(x)=162-9x \) gives the number of free books, \( f(x) \), that remain to be given away after x days. Which of the following is the best interpretation of \( f(18)=0 \) in this context?
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