Je continue ce que je t'ai déja répondu sur l'autre poste.
• 35/4 × 12 = (35×3×4)/4 = 35 × 3 = 105
• 3,4 × 5/17 = 34/10 × 5/17 = (34×5)/(10×17) = (2×17×5)/(2×5×17) = 1
• 7/3 × 36,9 = (7×36,9)/3 = (7×3×12,3)/3 = 7 × 12,3 = 7 × 10+ 7 × 2,3 = 70 + 16,1 = 86,1
Exercice 36
a• 1/4 × 100 = 100/4 = 25
b• 3/4 × 60 = (3×60)/4 = (3×4×15)/4 = 3×15 = 45
c• 5/3 × 360 = (5×360)/3 = (5×3×120)/3 = 5 × 120 = 600
d• 80/100 × 30 = 8/10 × 30 = (8×30)/10 = (8×3×10)/10 = 8×3 = 24
e• 3/2 × 24 = (3×24)/2 = (3×2×12)/2 = 3 × 12 = 36
f• 11/11 × 2312 = 1 × 2312 = 2312
car 11/11 = 1
Essaie de comprendre le méthode pour pouvoir la réutiliser plus tard.
