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Calculeaza respectand ordinea efectuarii operatitiilor. 800-721:7-69×8= 230+424:4×5= (800-758): 3+93×6= 302×4-(421+118):7=

Răspuns :

800-103-552 =145
230+106×5=230+530=760
42:3+558=14+558=572
302×4-539:7=1208-77=1131