12. Calculaţi: a) [9²+9 2³ +701:3² 13 b) 10²-[(2²+2): 12+3": 3]; c) [72³ - (1 +7° +5¹ 5¹3)]: 49¹¹; d) [1+27:25+3(3-3¹2)1²:3²; e) [4³-2: (5-3³-5³-3²)-2]:3³; 1)[72+10²: (2² 18:2¹-2²)-31:2² f) 3. Calculat​