Calculer et simplifier si possible le résultat. Svp

A. 11/48 + 5/12 = 11/48 + 20/48 = 31/49 B. 5/14 + 13/7 = 5/14 + 26/14 = 31/14 = 2 3/14 C. 47/81 - 5/9 = 47/81 - 45/81 = 2/81 D. 14/5 - 17/10 = 28/10 - 17/10 = 11/10 = 1 1/10 E. 23/36 - 2/9 = 23/36 - 9/36 = 14/36 F. 4 + 5/11 = 4 5/11 G. 17/24 - 3/8 = 17/24 - 9/24 = 8/24 = 1/3 H. 7/3 + 5/12 = 28/12 + 5/12 = 33/12 = 2 9/12 = 2 3/4