Bonjour
a. - 2 + 4/5 + 5/6
= (- 2 x 30) / (1 x 30) + (4 x 6) / (5 x 6) + (5 x 5) / (6 x 5)
= - 60/30 + 24/30 + 25/30
= - 60/30 + 49/30
= - 11/30
b. 1/2 + 2/3 + 3/4
= (1 x 6) / (2 x 6) + (2 x 4) / (3 x 4) + (3 x 3) / (4 x 3)
= 6/12 + 8/12 + 9/12
= 23/12
c. - 2 + 1/8 - 5/16
= (- 2 x 16) / (1 x 16) + (1 x 2) / (8 x 2) - 5/16
= - 32/16 + 2/16 - 5/13
= - 37/12 + 2/16
= - 35/16
d. 5/16 - 7/24 + 1
= (5 x 3 )/ (16 x 3) - (7 x 2) / (24 x 2) + (1 x 48) / (1 x 48)
= 15/48 - 14/48 + 48/48
= 63/18 - 14/48
= 49/48.
