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2025年9月国际A卷 · 第 5 题

2025年9月国际A卷 · 原库模块 1 · Q5 原库参考解析

There are a total of 1,200 milligrams of phosphorus in a sample of soil. Each kilogram of this sample contains 600 milligrams of phosphorus. Which equation represents this situation, where x is the mass, in kilograms, of the sample of soil?
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