Bonjour,
1- Tu le feras toi-même les tables c'est depuis le primaire.
2-
a. 1/4 + 1/6 = (1 x 3) / (4 x 3) + (1 x 2) / (6 x 2) = 3/12 + 2/12 = 5/12
b. 3/4 + 5/6 = (3 x 3) / (4 x 3) + (5 x 2) / (6 x 2) = 9/12 + 1012 = 19/12
c. 7/4 - 2/6 = (7 x 3) / (4 x 3) - (2 x 2) / (6 x 2) = 21/12 - 4/12 = 17/12
d. - 11/4 + - 7/6 = (- 11 x 3) / (4 x 3) - (7 x 2) / (6 x 2) = - 33/12 - 14/12 = - 47/12
e. 1/4 - 1/6 = (1 x 3) / (4 x 3)- (1 x 2) / (6 x 2) = 3/12 - 2/12 = 1/12
f. 1/4 + 5/6 = (1 x 3) / (4 x 3) + (5 x 2) / (6 x 2) = 3/12 + 10/12 = 13/12.
