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12. Calculaţi, folosind formula √a·b = √a √b, unde a 20, b≥0: a) √√4-25; b) √√36.9; c) √√81.49; d) √100-49; e) √√64-225; f) √√81-400; g) √144-0,25; h) √1,21.0,04.
plzz dau coroana​