Bonjour
Calculer en détaillant chaque étape et en donnant le résultat sous la forme d'une fraction laplus simple possible.
A = 12/7 - 4/7 x 35/12
A = 12/7 - 4/12 x 35/7
A = 12/7 - 4/(3 x 4) x (7 x 5)/7
A = 12/7 - 1/3 x 5
A = 12/7 - 5/3
A = (12 x 3)/(7 x 3) - (5 x 7)/(3 x 7)
A = 36/21 - 35/21
A = 1/21
B = - 7/12 + 3/4 : (-9)
B = -7/12 - 3/4 x 1/9
B = -7/12 - 3/9 x 1/4
B = -7/12 - 1/3 x 1/4
B = -7/12 - 1/12
B = -8/12
B = (-2 x 4)/(3 x 4)
B = -2/3
C = (4/5 + 7/10) : (5/8 - 5/6)
C = [(4 x 2)/(5 x 2) + 7/10] : (5/8 - 5/6)
C = (8/10 + 7/10) : [(5 x 3)/(8 x 3) - (5 x 4)/(6 x 4)]
c = 15/10 : (15/24 - 20/24)
C = 15/10 : (-5/24)
C = 15/10 x (-24/5)
C = 15/5 x (-24/10)
C = 3 x (-12/5)
C = -36/5
D= (5/6-2) / (4/3 - 7/4)
D = (5/6 - 12/6) / (16/12 - 21/12)
D = -7/12 / (-5/12)
D = -7/12 x (-12/5)
D = 7/5
