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4 Efectuați:
a 3+10 [362+10 (24+78:6)];
b[434:14-(5608: 8+924:33): 271 +2 -1;
c71+5 (100-2 (306:9+6)]+54:6-21;
d (520:10-7 (3+ 18:9)] 5+6 (15 12-15 10): 15;​