



What are the advantages and disadvantages of different scale representations? How are ratios used in photography (e.g., aperture ratio, aspect ratio)?
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tỷ số và tỷ lệ 2in1
- How can you test if two proportions are equivalent?
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- Explain the relationship between speed and distance when time is constant. Two trains start from the same point at the same time and travel in opposite directions. The ratio of their speeds is 5 7. After 3 hours, they are 360 km apart. Find the speed of each train.
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