Răspuns:
A={ -12; -11; -10; -9; -8; -7; -6; -5; -4; -3; -2; -1}
B={-7; -6; -5; -;4 ;-3; -2; -1; 1; ;2 ; 3; 4; 5; 6; 7; 8; 9; 10 ; 11; 12}
SA=-78
SB=50
C={-7; -6; -5; -4; -3; -2; -1}
Explicație pas cu pas:
b) SA=-12-11-10-9-8-7-6-5-4-3-2-1=-(1+2+3+...+12)=-12*13:2=-6*13=-78
SB=-7-6-5-4-3-2-1+1+2+3+4+5+6+7+8+9+10+11+12 =8+9+10+11+12=50
