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ZX-564209B94B2026年3月国际A卷 · 第 8 题
2026年3月国际A卷 · 原库模块 1 · Q8 原库参考解析
When a scientist began observing a sample of an isotope, the mass of the sample was 530,000 milligrams. The mass of the sample decreases by half approximately every 5 days. Which of the following is closest to the mass, in milligrams, of the sample 35 days after the scientist began observing the sample?
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