\(a)\) \({3.5^2} - 16:{2^2} = 3.25-16:4 \)\(= 75-4 = 71\)
\(b)\) \({2^3}.17 - {2^3}.14 = 8.17-{\rm{ }}8.14{\rm{ }}\)\( = 8\left( {17 - 14} \right)\)\(= 8.3 = 24\)
\(c)\) \(15.141 + 59.15 = 15.(141+59) \)\(=15.200 = 3000\)
\(d)\) \(17.85 + 15.17 – 120 \)\(= 17.(85+15) -120\)
\(= 17.100 – 120 = 1700 – 120 = 1580\)
\(e)\) \(20 - \left[ {30 - {{\left( {5 - 1} \right)}^2}} \right]\)
\(= 20 - (30 - {4^2})\)
\(= 20 - (30 - 16) \)
\(= 20 – 14 = 6\)
