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20. Calculaţi:
a) 320-(815: 420-23) 20:16¹5;
b) 165: 86 +(48 275) : (85-97);
c) 814: 27³-7- [278 (173 17-15 173)-345 (139-41 - 139 39)];
d) (83) ²: (8-25)² + 16 26.8³ +32 4:2¹;
e) 97 (9-34)2 + 35 27²: (3³)³ +81-3²:3³.
Repede!! Dau coroana