Tìm x, biết: \(\,\frac{2}{3}.x - \frac{1}{2} = 1\frac{1}{2}\)

* Hướng dẫn giải

\(\begin{array}{l}\,\frac{2}{3}.x - \frac{1}{2} = 1\frac{1}{2}\\\,\,\,\,\,\frac{2}{3}.x\,\,\,\,\,\,\,\,\,\, = 1\frac{1}{2} + \frac{1}{2}\\\,\,\,\,\,\frac{2}{3}.x\,\,\,\,\,\,\,\,\,\, = \,1 + \frac{1}{2} + \frac{1}{2}\\\,\,\,\,\,\frac{2}{3}.x\,\,\,\,\,\,\,\,\,\, = \,2\\\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\, = 2:\frac{2}{3}\\\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\, = \,3\end{array}\)

Chọn B