10. Efectuați:
a) 34(-7+2)+(-5)+(-3-1+4) (-7);
b) -7—(3+2–6--1)+(-6+3-1);
c) 5+(2–8–3)-(-9+7)+(-3)–2+1;
d) -15+(-3+2–1––7+5–2)H(-9);
e) 6 (3+8)-(-6)+(-6H-12+3-1);
f) -2-(-8+6)-(13+11-1)-(-2)​