Răspuns:
Salutare!
a= -1+3-5+7-9+11
a= 6.
b= -5-[-8+(-4)]-(-7)
b= 0
a=2-5+7-9+11
a=-3+7-9+11
a=4-9+11
a=-5+11
a=6
b=-5-[-8+(-4)]-(-7)
b=-5-(-8-4)+7
b=-5-(-12)+7
b=-5+12+7
b=7+7
b=14
