Bonjour
a. 1 + 2/3 x 9/5
= 1 + 18/15
= (1 x 15) / (1 x 15) + 18/15
= 15/15 + 18/15
= 33/15
= (3 x 11) / (3 x 5)
= 11/5
b. 9/8 - 7/3 + 5
= (9 x 3) / (8 x 3) - (7 x 8) / (3 x 8) + (5 x 24) / (1 x 24)
= 27/24 - 56/24 + 120/24
= 91/24
c. 4 x 3/7 - 5/6
= 12/7 - 5/6
= (12 x 6) / (7 x 6) - (5 x 7) / (6 x 7)
= 72/42 - 35/42
= 37/42.
