Bonjour
Calcule la somme S = 756/441 + 19/42 et donne le résultat sous la forme irréductible.
S = 756/441 + 19/42
7 + 5 + 6 = 18 = 2 x 9 (multiple de 9)
4 + 4 + 1 = 9 (multiple de 9)
S = (84 x 9)/(49 x 9) + 19/42
S = 84/49 + 19/42
S = (12 x 7)/(7 x 7) + 19/42
S = 12/7 + 19/42
S = (12 x 6)/(7 x 6) + 19/42
S = 72/42 + 19/42
S = 91/42
