Réponse :
A=3-2×5-1
A = 1×5-1
A = 5-1
A = 4
B= 4-(-5)-3+8-(+2)
B = 4-5-3+8-2
B = -1-3+8-2
B = -4+8-2
B = 4-2
B = 2
C=4-(5+2×7)-(3-7)
C =4-19-4
C = -15-4
C = -19
D = (-2×3+4×(-5-4)):7
D = (-2×(-9))÷7
D = 18÷7
D ≈ 2,6
E=(-5)×(-3+2-1)×(-6)
E = (-5)×(-2)×(-6)
E = 10×(-6)
E = -60