Bonjour
a. 1/6 + 3/6 = 4/6 = (2 x 2) / (2 x 3) = 2/3
b. 31/14 - 5/14 = 26/14 = (2 x 13) / (2 x 7) = 13/7
c. 25/33 + 19/33 = 44/33 = (11 x 4) / (11 x 3) = 4/3
d. 17/18 + 19/18 = 36/18 = (18 x 2) / (18 x 1) = 2
e. 15/37 + 22/37 = 37/37 = 1
f. 45/143 + 20/143 = 65/143 = (13 x 5) / (13 x 11) = 5/11
g. 1/27 + 4/27 + 7/27 = 12/27 = (3 x 4) / (3 x 9) = 4/9
h. 16/28 - 7/28 - 5/28 = 4/28 = (4 x 1) / (4 x 7) = 1/7
i. 13/19 - 5/19 + 6/19 = 14/19.
