qui peut m'aider pour l'exercice 1 svp

Bonjour

A = - 7/4 + 1/4
A = 6/4
A = 2 x 3 / 2 x 2
A = 3/2
A = 1,5

B = - 7/4 - 1/4
B = - 8/4
B = 4 x - 2 / 4 x 1
B = - 2/1
B = - 2

C = - 7/4 x 1/4
C = - 7/16
C = - 0,4375

D = - 7/4 : 1/4
D = - 7/4 x 4/1
D = - 28/4
D = 4 x - 7 / 4 x 1
D = - 7/1
D = - 7

E = 7/4 - - 1/4
E = 7/4 + 1/4
E = 8/4
E = 4 x 2 / 4 x 1
E = 4/1
E = 4

F = - 7/2 + 5
F = - 7/2 + 5 x 2 / 2 x 2
F = - 7/2 + 10/2
F = 3/2
F = 1,5

bonjour

-2/4 +1/4 = -1/4

-7/4-1/4 = -8/4 = -2

-7/4 x 1/4 = -7/16

-7/4 +1/4 = -6/4 = -3/2

-7/4 - (-1/4) = -7/4 +1/4 = -6/4 = -3/2

-7/2 +5 = -7/2 +10/2 = +3/2