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3. Calculaţi: a) 40-125: 5+2 ¹9:2¹7 +(2²) ²]; b) [(5¹)²-5³]: (5².4); c) 50-1460: [125:5² +2¹6:47 +(2²)']; d) (52020 +52019): (52020-2-52019); e) [(17-4²) +(65-4³) 2010: (2¹)' +[(6¹)-(6)] A) -2020-20212019; 8) [2¹².2¹ +255 : 50-(3²)] : [4²-2²-2² + (5")" -(3³)]. g) 2020​