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並前往https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-ratio-proportion/cc-7th-write-and-solve-proportions/v/find-an-unknown-in-a-proportion

Worked example: Solving proportions (video) | Khan Academy

Learn the reasoning behind solving proportions. We'll put some algebra to work to get our answers, too.

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