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並前往https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-ratio-proportion/cc-7th-proportional-rel/v/introduction-to-proportional-relationships

Intro to proportional relationships (video) | Khan Academy

And a proportional relationship between two variables is just a relationship where the ratio between the two variables is always going to be the same thing. So ...

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