1. Calculaţi: (a) 1+1-1-1:1;
b) 1-(1+1)-(1-1):1;
c) 9999-0-0:7777+5555;
d) 333-33-3+33³;
e) 100-100:10:1000; f) 1000000 (10-1000)-100;
g) (1000-10): 10+10000 10000;
h) (10¹-10³ +10²): 10¹ +10°; (325-325)-[256 +1435: (48 +239)];
i) 3+3 [3-3-3-(3:3)]:3;
k) [450:5:(3-6)+35]-7-140+(540:60+7)-(63:9); l) [500-(3500: 700-80-40-9) (64:8)]: 9-(72:6): (81:27);
m) 2 (350 [491-3 (125-78)] +350).​