Bonjour
a. 2/7 - 3/8 = 16/56 - 21/56= - 5/56
b. 5/4 x 12/25 = 60/100 = (20 x 3) / (20 x 5) = 3/5
c. 2 - 1/9 = (2 x 9) / (1 x 9) - 1/9 = 18/9 - 1/9 = 17/9
d. 9/7 + 2/3 = 27/21 + 14/24 = 41/21
e. 15/8 : 3/7 = 15/8 x 7/3 = 105/24 = 35/8
f. 5 : 3/4 = 5 x 4/3 = 20/3.
