Tìm x, biết: a) 5,4:x =  - 1,2; b) x - 2/5 =- 2/3

a) \(5,4:x =  - 1,2\)

    \(x = 5,4:\left( { - 1,2} \right)\)

    \(x =  - 4,5\).

Vậy \(x =  - 4,5\).

b) \(x - \frac{2}{5} = \frac{{ - 2}}{3}\)

\(x = \frac{{ - 2}}{3} + \frac{2}{5}\)

\(x = \frac{{ - 10}}{{15}} + \frac{6}{{15}}\)

\(x = \frac{{ - 4}}{{15}}\)

Vậy \(x = \frac{{ - 4}}{{15}}\).

c) \(27{\left( {3x - \frac{1}{5}} \right)^3} =  - 8\)

\({\left( {3x - \frac{1}{5}} \right)^3} =  - \frac{8}{{27}} = {\left( { - \frac{2}{3}} \right)^3}\)

Suy ra \(3x - \frac{1}{5} =  - \frac{2}{3}\)

\(3x =  - \frac{2}{3} + \frac{1}{5}\)

\(3x =  - \frac{7}{{15}}\)

\(x =  - \frac{7}{{45}}\)

Vậy \(x =  - \frac{7}{{45}}\).