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Cours de vacances - Mathématiques cinquième Page 4. Page 5. 5. © Magnard, 2016 ? Delta Maths 4e ? Livre du professeur 4 × x = 7 × 10, donc 4 × x = 70. 2. x = 70. 4. = 17,5. 8. a) x = ×. 11 9. 4. = 24 
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multiplication et ordres de grandeur CORRIGE ? M. QUET. EXERCICE 1. Calculer mentalement : a. 20 × 30 = 600 b. 40 × 10 = 400 c. 60 × 70 = 4 200 d. 90 × 50 = 4 500 e. 200 × 60 = 12 000 f. 40 × 700 
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