Bonsoir
A= -1 +2 -3 +4 -5
= -3
B= -20-17 +5 +10+(-6)
= -20-17 +5 +10-6
= -28
A= -7-5+10+(-7)
= -7-5+10-7
=-9
B= 15 +(+3) -4+(-9)
= 15 +3 -4-9
=5
