a) \(204 - 84:12 =204 - 7 = 197;\)
b) \({15.2^3} + {4.3^2} - 5.7 = 15.8 + 4.9 - 35 \)
\(= 120 + 36 - 35 = 121\)
c) \({5^6}:{5^3} + {2^3}{.2^2} = {5^{6 - 3}} + {2^{3 + 2}} \)
\(= {5^3} + {2^5} = 125 + 32 = 157\)
d) \(164.53 + 47.164 = 164 .(53+47)\)
\(=164.100 = 16400\)