Efectuati urnatoarele exercitii in doua moduri:
1)desfiintand parantezele si facand suma termenilor;
2) calculand separat fiecare paranteza si efectuand apoi operatiile indicate.
a)70-(30-15+84);
b)(25-13+22);
c)-100+(25-40)-(80-50-+40);
d)(43-18)-(5-20)+(-7+100);
e)(300-250-4500)-(80-75+25);
f)(76-39-17)+(-5+47);

va rog mult, am nevoie!!​