Sagot :
Bonjour,
a-b-c+d
A = (a - b)-(c-d) = a-b -c +d
D= (a - b)-( c + d) = a-b-c -d
B=a - (b + c +d) = a-b -c -d
E= a - (b + c -d) = a-b -c +d
C = a (b + c) +d = ab+ac +d
F= d - (b + c - a) = d-b -c +a = a-b-c+d
G=a - b - (d - c) = a-b -d +c
H=(d - c) - ( a + b) = d-c -a -b