Tìm (x), biết:

a) \(\left( {454 - x} \right) + {4^3} = 116\)

\(\left( {454 - x} \right) + 64 = 116\)

\(454 - x = 52\)

\(x = 402\)

Vậy \(x = 402\).

b) \(3 - \left( {x - 17} \right) = 289 - \left( {36 + 289} \right)\)

\(3 - \left( {x - 17} \right) = 289 - 36 - 289\)

\(3 - \left( {x - 17} \right) =  - 36\)

\(x - 17 = 3 - \left( { - 36} \right)\)

\(x - 17 = 39

c) \(2\left( {x + 1} \right) + 18 =  - 4\)

\(2\left( {x + 1} \right) =  - 22\)

\(x + 1 =  - 11\)

\(x =  - 12\)

Vậy \(x =  - 12\).

d) \(\left( {4x + 11} \right) - \left( {x + 34} \right) = 67\)

\(4x + 11 - x - 34 = 67\)

\(4x - x = 67 - 11 + 34\)     

\(3x = 90\)

\(x = 30\)

Vậy \(x = 30\).