Bonjour
6)
a. 2 + 1/4 = (2 x 4) / (1 x 4) + 1/4 = 8/4 + 1/4 = 9/4
b. 7 - 2/3 = (7 x 3) / (1 x 3) - 2/3 = 21/3 - 2/3 = 19/3
c. 1,6 + 8/9 = (1,6 x 9) / (1 x 9) + 8/9 = 14,4/9 + 8/9 = 22,4/9
d. 3 - 25/3 = (3 x 3) / (1 x 3) - 25/3 = 9/3 - 25/3 = - 16/3
7)
a. 4 - 2/7 = (4 x 7) / (1 x 7) - 2/7 = 28/7 - 2/7 = 26/7
b. 5 + 9/4 = (5 x 4) / (1 x 4) + 9/4 = 20/4 + 9/4 = 29/4
c. 19/3 - 5 = 19/3 - (5 x 3) / (1 x 3) = 19/3 - 15/3 = 4/3
d. 6/5 + 2 = 6/5 + (2 x 5) / (1 x 5) = 6/5 + 10/5 = 16/5.
