Réponse :
A = -13/8 + 7/16
A = -26/16 + 7/16
A = -26 + 7/16
A = -19/16
B = (3/10 - 2/5) x 1/2
B = (3/10 - 4/10) x 1/2
B = (3 - 4/10) x 1/2
B = -1/10 x 1/2
B = -1 x 1/10 x 2
B = -1/20
C = 7/4 ÷ 5/2
C = 7/4 x 2/5
C = 7 x 2/4 x 5
C = 14/20
C = 7/10
D = 5 - 3 x (-5)²
D = 5 - 3 x 25
D = 5 - 75
D = -70
E = (1/8 - 7/12) ÷ (7/6 + 7/16)
E = (3/24 - 14/24) ÷ (56/48 + 21/48)
E = -11/24 ÷ 77/48
E = -11/24 x 48/77
E = -528/1848
E = -2/7