Bonjour
a. 17/- 24 + (- 5/36)
= (17 x 3) / (24 x 3) - (5 x 2) / (36 x 2)
= 51/72 - 10/72
= 41/72
b. 3/16 - - 1/12
= (3 x 3) / (16 x 3) + (1 x 4) / (12 x 4)
= 9/48 - 4/48
= 5/48
c. 8/- 17 - (- 1/15)
= (- 8 x 15) / (17 x 15) + (1 x 17) / (15 x 17)
= - 120/255 + 17/255
= - 103/255
d. 2/5 + - 2/15 - 7/12
= (2 x 12) / (5 x 12) - (2 x 4) / (15 x 4) - (7 x 5) / (12 x 5)
= 24/60 - 8/60 - 35/60
= - 19/60.
