Răspunsuri

2014-04-07T20:42:37+03:00
A)-1+(-1)+.....+(-1) de 22 de ori= -1*22=-22
b)-4+(-8)+....+(-64)+64     2(-1+(-2)+(-3)+....+(-23)) +23=2 (-1+(-23))*23/2

2(-24*23/2)
2*(-276)=-552