Réponse:
Bonsoir !
E = 26 - ( - 14 + 6 - 5 ) + ( - 8 + 7 )
= 26 - ( - 8 - 5 ) + ( - 1 )
= 26 - ( - 13 ) - 1
= 26 + 13 - 1
= 39 - 1
= 38
F = 10 - [ 8 - 17 + 3 - ( 9 - 20 ) ]
= 10 - [ 8 - 17 + 3 - ( - 11 ) ]
= 10 - [ 8 - 17 + 3 + 11 ]
= 10 - [ - 9 - 17 + 3 + 11 ]
= 10 - [ - 26 + 3 + 11 ]
= 10 - [ - 23 + 11 ]
= 10 - [ - 12 ]
= 10 + 12
= 22
G = 12 - ( - 8 + 4 - 7 ) - ( 9 + 3 - 4 )
= 12 - ( - 4 + 4 - 7 ) - ( 12 - 4 )
= 12 - ( - 7 ) - ( 8 )
= 12 + 7 - 8
= 19 - 8
= 11
H = 5 - 12 - ( 5 - 11 ) - ( 7 - 14 )
= 5 - 12 - ( - 6 ) - (- 7 )
= 5 - 12 + 6 + 7
= - 12 + 6 + 7
= - 6 + 7
= 1
Voilà je pense que c'est ainsi ^^'
