3. Calculaţi:
a) |-4-1-5/+2+3=
b) (-20+3)-(-20-5)+(-5-3) =
c) |6-15 +17 - |14 – 20 – 3 =
d) 13-1-2+5-(-4+16) - 2) =
e) -{-9-1-5+(-3+14)] -3}=
f) - 13+{-17-1-31+19-(-3)]} =
g) (1+2+3+ ... +100)+(-1-2-3-...-105) =
h) -2-4-6-... - 40 =​