Tính: \(\,2\frac{1}{2} - \left( {2\frac{1}{3} + 1\frac{1}{2}} \right)\)

* Hướng dẫn giải

\(\begin{array}{l}\,\,\,2\frac{1}{2} - \left( {2\frac{1}{3} + 1\frac{1}{2}} \right)\\ = 2 + \frac{1}{2} - \left( {2 + \frac{1}{3} + 1 + \frac{1}{2}} \right)\\ = 2 + \frac{1}{2} - \left( {3 + \frac{5}{6}} \right)\\ = \left( {2 - 3} \right) + \left( {\frac{1}{2} - \frac{5}{6}} \right)\\ =  - 1 - \frac{1}{3}\\ =  - 1\frac{1}{3}\end{array}\)

Chọn B