Bonsoir ;
A = (1/2 + 7/8) x 8/11 = (4/8 + 7/8) x 8/11 = (11/8) x 8/11 = 1 .
B = 2 - 8/3 x 8/5 = 2 - 64/15 = 30/15 - 64/15 = - 34/15 .
C = (16/5) / (8/15) = 16/5 x 15/8 = 16/8 x 15/5 = 2 x 3 = 6 .
D = (-7)/(-8) - 5/8 x 5 = 7/8 - 25/8 = -18/8 = -9/4 .
E = (2 - 4/5 + 1/3)/(2 + 4/5 + 1/3)
= (30/15 - 12/15 + 5/15)/(30/15 + 12/15 + 5/15)
=(23/15)/(47/15) = 23/15 * 15/47 = 23/47 .