bonsoir
A = 7/3 - 1/3 = 6/3 = 2
B = 7/4 - 9/20 = 35/20 - 9/20 = 26/20 = 13/10
C = 13/11 + ( - 8/11 x - 3/4)
= 13/11 + 24/44
= 52/44 + 24/44 = 76/44 = 19/11
D = 7/3 - 30/42 = 98/42 - 30/42 = 68/42 = 34/21
E = 10/3 * 18/15 = 180/ 45 = 4
F = 6/5 - ( 3/36) = 6/5 - 1/12 = 72/60 - 5/60 = 67/60