Calculează:
a) 5 - (2•5 + 1) - 4.5+ 1;
b) 5+5• (9 +3 - 4);
e) (2 +2•3)2:2^4;
f) (5^2+10^5^2) : 11.
c) (7.2 + 4). 15 - 11 - 14;
d) 7. [5.3-(4.3-5)] + 3.4;​