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Calculaţi: 5. a) (2+3.4). [25 (-2) (-2)' +(-2)]; b) (-1)° +(-1)2021 (-2)+(-1)2020 (-2)²-(-3); c) (-1) 20 (-2+3)+6: (7-5°)+(-5) 01 (-5) 2019; 2021 2021 d) (30.3.3:35 +2020°): {[(-3) ] *):{[(-3)]-27 +20210) ​