Tìm x, biết: a) x - 7/6 = -1/3 b) |2x - 1| = 1,5
Giải thích
a. \(x - \frac{7}{6} = \frac{{ - 1}}{3}\)
\(x = \frac{{ - 1}}{3} + \frac{7}{6}\)
\(x = \frac{5}{6}\)
b. \(|2x - 1| = 1,5\)
TH1: \(2x - 1 = 1,5\) \(2x = 1,5 + 1\) \(2x = 2,5\) \(x = 1,25\) | TH2: \(2x - 1 = - 1,5\) \(2x = - 1,5 + 1\) \(2{\rm{x}} = - 0,5\) \(x = - 0,25\) |
Vậy \(x \in \{ 1,25; - 0,25\} \).