bonsoir
a) 10/3 + 8/9 = 30/9 + 8/9 = 38/9
b) 2/5 x 8/9 = 16/45
c) 3/2 + ( 3/4 x 7/3) = 3/2 + 21/12 = 18/12 + 21/12 = 39/12 = 13/4
d) 5/4 ( 4/3 - 7/15) = 5/4 ( 20/15 - 7/15) = 5/4 * 13/15 = 65/60 = 13/12
e) 1/2 : ( 3/4 + 1/6) = 1/2 : ( 9/12 + 2/12) = 1/2 : 11/12 = 1/2 x 12/11 = 12/22
= 6/11