bonjour
I = - 1 + 2 - 3 + 4 - 5 + 6 - 7 + 8
= 20 - 16
= 4
J = - ( 1 + 2 ) - ( 3 + 4 ) - ( 5 + 6 ) - ( 7 + 8 )
= - 3 - 7 - 11 - 15
= - 36
K = - 1 + ( 2 - 3 + 4 ) - ( 5 + 6 - 7 ) + 8
= - 1 + 3 - 4 + 8
= 11 - 5 = 6
L = [ ( - 1 + 2 ) - ( 3 + 4 )] - [ ( 5 + 6 ) - ( 7 + 8 ) ]
= ( 1 - 7 ) - ( 11 - 15 )
= - 6 - ( - 4 )
= - 6 + 4
= - 2
