Thực hiện phép tính: a) 78 - 12.5 + 3^2   b) 4^2.55 + 2.45.8 - 2022^0

a) \(78 - 12.5 + {3^2} = 78 - 60 + 9 = 18 + 9 = 27\)

b) \({4^2}.55 + 2.45.8 - {2022^0} = 16.55 + 16.45 - 1 = 16.100 - 1 = 1599\)

c) \(1800:\left\{ {49 + \left[ {2.{{\left( {{6^2} - 34} \right)}^3} - {5^4}:{5^3}} \right]} \right\}\)

 \( = 1800:\left\{ {49 + \left[ {{{2.2}^3} - 5} \right]} \right\}\)

\( = 1800:\left\{ {49 + \left[ {2.8 - 5} \right]} \right\}\)

\( = 1800:\left\{ {49 + 11} \right\}\)

\( = 1800:60\)

\( = 30\)