A = 1 - [(5/4) x (2/15)] on commence toujours par la multiplication
(5/4) x (2/15) = 5 x 2/(4 x 15) = 5 x 2/(2 x 5 x 3 x 2) = 1/6
A = 1 - (1/6) = 6/6) - 1/6 = (6 - 1)/6 = 5/6
B = (2/3) - (1/4) x 6) + 7 on commence par X
1/4) x 6 = 6/4 = 3/2
B = 2/3) - (3/2) + 7 = (4/6) - (9/6) + 42/6 = (4 - 9 + 42)/6 = 37/6
C = (1 + (1/2))/((1/4)- 3) = 3/2/-11/4 = 3 x 4/(- 2 x 11) = - 6/11
D = (- 7/5 + (4/3)) + (7 - (4/3)) = -21/15) + 20/15 + (21/3 - (4/3))
= - 1/15) + (-17/3) = - 1/15 + ( - 85/15) = - 86/15
Vous faite le reste
