Bonjour
Additionner et soustraire des fractions.
Calculer et donner le résultat sous forme d'une fraction irréductible.
A= 2/7+3/14-1/21
A = (2 x 6) / (7 x 6) + (3 x 3) / (14 x 3) - (1 x 2) / (21 x 2)
A = 12/42 + 9/42 - 2/42
A = 19/42
B= 5/6-19/3+7/18
B = (5 x 3) / (6 x 3) - (19 x 6) / (3 x 6) + 7/18
B = 15/18 - 114/18 + 7/18
B = 92/18
B = (2 x 46) / (2 x 9)
B = 46/9
C=2/1+1/3-1/6
C = (2 x 6) / (1 x 6) + (1 x 2) / (3 x 2) - 1/6
C = 12/6 + 2/6 - 1/6
C = 13/6
D= 3/2-(1/3+1/4+1/6)
D = (3 x 6) / (2 x 6) - [(1 x 4) / (3 x 4) + (1 x 3) / (4 x 3) + (1 x 2) / (6 x 2)]
D = 18/12 - (4/12 + 3/12 + 2/12)
D = 18/12 - 9/12
D = 9/12
D = (3 x 3) / (3 x 4)
D = 3/4.
