Est-ce que vous pouvez me aider s'il vous plaît

A=13-20=-7
B=7+21=28
C=-20+6=-14
D=-6-2=-8
E=-6÷(-3)-6=-4

Exercice 2
A = 5/6+9/4 = 10/12+27/12 = 37/12
B = -10/7-3/14 = -20/14-3/14 =-23/14
Exercice 1
A = 13+4x(-5)= 13-20= -7
B = 7-8x(-3) = 7+24 = 31
C = 4x(-5)-3x1(-2) = -20+6= -14
D = (9-15)+(-2) = =-6-2 = -8
E = (7-13):(7-8)+3x(-2) = -6:-1-6 = -12
Bon courage.