Réponse:
a) -3-21+7+5+3=-9
b) -7+4,5-28+20,5=-10
c) 17-(-11)-14+5 =17+11-14+5 =19
bonjour;
a)
-3 -21 +7 +5+3
= 7+5+3 -3-21
= 15-24
= -9
b)
4,5+20,5-7-28
= 25- 35
= -10
c)
17-29+40-14+5
= 17+40+5 -29-14
= 62- 43
=19
