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Calculeaza respectand regurile pe care le introduc parabtezele in calcule. a) 125:5+(13+64:2); b) (37-18:2):7+108:2 ; c) 6x9:[6-(13-18:2)] d) [(9-6)×(8+9)]+100:(4+6) ; e) 36:9+4×[20+6×(100:4-42:2)] ; f) 126-[(63×2:6+109)×(75:25+21:3)]:10.