Tìm x , biết: a) x + 1 3 = 2 5 − ( − 1/ 4 )
Giải thích
a) \(x + \frac{1}{3} = \frac{2}{5} - \left( { - \frac{1}{4}} \right)\)
\(x + \frac{1}{3} = \frac{2}{5} + \frac{1}{4}\)
\(x + \frac{1}{3} = \frac{{13}}{{20}}\)
\(x = \frac{{13}}{{20}} - \frac{1}{3}\)
\(x = \frac{{19}}{{60}}\).
Vậy \(x = \frac{{19}}{{60}}\).