-1/2 * 1-2

To simplify the expression \(-\frac{1}{2} \times (1 - 2)\), follow these steps:

1. Calculate \(1 - 2\): \[ 1 - 2 = -1 \]

2. Now substitute \(-1\) back into the expression: \[ -\frac{1}{2} \times -1 \]

3. Multiply \(-\frac{1}{2}\) by \(-1\): \[ -\frac{1}{2} \times -1 = \frac{1}{2} \]

Thus, the final result is \(\frac{1}{2}\).