What's your question? Is it that the exponent on x changed from -1/2 to 1/2 or are you unable to understand how ##\frac 1 6 * \frac 1 {1/2} = \frac 1 3##?
If it's the latter, ##\frac a b \cdot \frac c d = \frac{ac}{bc}##.
Have you checked out the khanacademy link that I gave yesterday? Until you get your arithmetic skills up to where they need to be, you won't be able to follow even the simplest calculus explanations.