2026年3月国际B卷 · 第 4 题

2026年3月国际B卷 · 原库模块 2 · Q4 原库参考解析

A bookstore is giving away free books every day. The equation \( f(x)=200-10x \) 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 \( f(20)=0 \) in this context?

2026年3月国际B卷 · 第 4 题

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