https://www.youtube.com/watch?v=A8ZlEG37_yw
Exercices : https://fr.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates
S Wilbois
https://www.youtube.com/watch?v=A8ZlEG37_yw
Exercices : https://fr.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates
Leçon : https://pi.ac3j.fr/ratio-cycle-4/
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