Réponse :
Explications étape par étape
A = 13 + 4 - [ 7 - 2 (8 - 5 X 2) ]
⇔ A = 17 - [ 7 - 2 ( 8 - 10 ) ]
⇔ A = 17 - [ 7 - 2 ( - 2) ]
⇔ A = 17 - ( 7 +4 )
⇔ A = 17 - 11
⇔ A = 6
B = 26 - [ 9 - (3 - 4 x 6) ] + 7 x 3
⇔ B = 26 - [ 9 - ( 3 - 24 ) ] + 21
⇔ B = 26 - [ 9 - ( -21 ) ] + 21
⇔ B = 26 - 30 +21
⇔ B = 16
C = 9 X 4 - 4 (8-3) - [ 9 - (4 - 3 x 2) ]
⇔ C = 36 - 4 ( 5 ) - [ 9 - ( 4 - 6) ]
⇔ C = 36 - 20 - ( 9 - (-2 ) ]
⇔ C = 16 - 11
⇔ C = 5
D = 8 - [ 6 + 2 (8 - 5 X 4)] - 3 x 7
⇔ D = 8 - [ 6 + 2 ( 8 - 20 ) ] - 21
⇔ D = 8 - [ 6 + 2 (-12 ) ] - 21
⇔ D = 8 - ( 6 - 24 ) -21
⇔ D = 8 - 18 - 21
⇔ D = -31
E = - 11 + [ 5 + 2 x (9- 3 X 4) ] + 2 x 6
⇔ E = -11 + [ 5 + 2 x ( 9 - 12 ) ] + 12
⇔ E = - 11 + [ 5 + 2 x ( - 3) ] + 12
⇔ E = - 11 + ( 5 - 6 ) + 12
⇔ E = -11 -1 + 12
⇔ E = -12 +12
⇔E = 0