Bonsoir
Calculer et donner les résultats sous forme de fraction simplifiée le plus possible.
A= 8/5 -5/3 * (-2)
A = 8/5 + 10/3
A = (8 x 3) / (5 x 3) + (10x 5) / (3 x 5)
A = 24/15 + 50/15
A = 74/15
B= 1/2 - 6/10 * 3/2 + -1/7
B = 1/2 - 18/20 - 1/7
B = (1 x 70) / (2 x 70) - (18 x 7) / (20 x 7) - (1 x 20) / (7 x 20)
B = 70/240 - 126/240 - 20/240
B = 70/240 - 146/240
B = - 76/240
B = (4 x - 19) / (4 x 60)
B = - 19/60
C= 4/25 - (12/30 + 1/5)
C = 4/25 - [12/30 + (1 x 6) / (5 x 6)]
C = 4/25 - (12/30 + 6/30)
C = 4/25 - 18/30
C = (4 x 6) / (25 x 6) - (18 x 5) / (30 x 5)
C = 24/150 - 90/150
C = - 66/150
C = (6 x - 11) / (6 x 25)
C = - 11/25
D= 2 - 6/7 : 3- 7/6
D = 2 - 6/7 x 1/3 - 7/6
D = 2 - 6/21 - 7/6
D = (2 x 42) / (1 x 42) - (6 x 2) / (21 x 2) - (7 x 7) / (6 x 7)
D = 84/42 - 12/42 - 49/42
D = 84/42 - 61/42
D = 23/42.