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4. Efectuați: a) 3+10-[362+10 (24+78:6)]; b) [434:14-(5608:8 +924:33):27]:2-1; c) 71+5 [100-2 (306: 9+6)] +54:6-21; d) [520:10-7-(3+18:9)]-5+6 (15-12-15-10):15;
cu calculele va rog!!
dau coroana​