Tìm giá trị của x biết: (a) x − 1/2 = 3/4 . (b) 5/8 − x = − 1/3 .

a) \(x - \frac{1}{2} = \frac{3}{4}\)

\(x = \frac{3}{4} + \frac{1}{2}\)

\(x = \frac{3}{4} + \frac{2}{4}\)

\(x = \frac{5}{4}\)

Vậy \(x = \frac{5}{4}\).

b) \(\frac{5}{8} - x = \frac{{ - 1}}{3}\)

\(x = \frac{5}{8} + \frac{1}{3}\)

\(x = \frac{{15}}{{24}} + \frac{8}{{24}}\)

\(x = \frac{{23}}{{24}}\)

Vậy \(x = \frac{{23}}{{24}}\).

c) \(\frac{{3 - x}}{{15}} = \frac{4}{3}\)

\(3\left( {3 - x} \right) = 4.15\)

\(3 - x = \frac{{4.15}}{3}\)

\(3 - x = 20\)

\(x = 3 - 20\)

\(x = - 17\)

Vậy \(x = - 17\).