Bonjour
58)
a. 1/9 - 1/6 = (1 x 2) / (9 x 2) - (1 x 3) / (6 x 3) = 2/18 - 3/18 = - 1/18
b. 7/12 + 5/18 = (7 x 3) / (12 x 3) + (5 x 2) / (18 x 2) = 21/36 + 10/36 = 31/36
c. - 20/7 + 2/7 = - 18/7
59)
a. 5/6 - - 3/- 5 = 5/6 - 3/5 = (5 x 5) / (6 x 5) + (3x 6) / (5 x 6) = 25/30 + 18/30 = 43/30
b. - 3 + 7/4 = (- 3 x 4) / (1 x 4) + 7/4 = - 12/4 + 7/4 = - 5/4
c. 7,5/6 - 11/8 = (7,5 x 4) / (6 x 4) - (11 x 3) / (8 x 3) = 30/24 - 33/24 = - 3/24 = (3 x - 1) / (3 x 8) = - 1/8.
