Math Problem Solver

\[ \frac{-1}{2} + 3 - 1 = \frac{3}{2} = 1.5 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{-1}{2}\), \(\frac{3}{1}\), and \(\frac{-1}{1}\) is \(2\). \[ \begin{aligned} \frac{-1}{2} + 3 - 1 &= \frac{-1 \cdot 1}{2 \cdot 1} + \frac{3 \cdot 2}{1 \cdot 2} + \frac{-1 \cdot 2}{1 \cdot 2} \\ &= \frac{-1 + 6 + -2}{2} \\ &= \frac{3}{2} \end{aligned} \]