Răspunsuri

2014-06-24T22:35:44+03:00
||5|- |-5| -|3||=  |5-5-3|= |-3|=3

2)S=-1+2-3+3-4+....+40-41
S=-1-1-1....-1  }de 40 de ori

S=(-1)*40
S= -40