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Calculează: a) 195-6-[(4+2 13)-3.9 +17]; b) 5 (4+3-7)-2- (5+2 [10-3 (14-3-4)]}; c) (30+10 [2 d) 300-6-[( Calculează: a) 345: (344+344 +344) + 230: (229 +22⁹); b) (2: 250+ 623: 6¹3): [210310+ (2¹4)²]; 5:(5)² + (16-423: (8³)³ + 206: 106 [19-9 (57): (5³)]): 112; 366 (245:2¹5:34 + 9¹7: (32) ¹6 [102: 5-(326-28-4¹9) - 5]).​