In Google Docs' document editor, there's rudimentary support for adding mathematical equations.
I didn't find anything like that in Google Slides' editor.
Anyone know a workaround?
I found this online LaTeX editor. It allows you to type LaTeX and download an image of the resulting equation. It even shows in real time what the equation looks like.
I'm going to use the online LaTeX equation editor to place an equation in Google Presentations, just like you wanted to.
Here's an example:
It's a kind of REST interface that generates a downloadable .png image like this, similar to Google Chart API.
There is now a Chrome add-on for mathematical equations, but it's not inline.
It's named Math Equations
See this thread in the Google Docs forums.
A mathematical formula created in a Google Docs text document can be dragged to a presentation slide.
Checkout the Chrome extension EquatIO.
With it it is possible to add equations with LaTeX to google slides.
You can install Math Equations add-on for Slides, and then go to Add-ons → Math Equations → Menu.
There is no direct and clean way to add equations to Google Slides but you can make an equation in Microsoft Excel, copy it and paste it in Slides.
Note that you can't do this from Google Docs, that is, if you copy-paste an equation created in Docs, it will appear as plain text in Slides losing all equation formatting.
A tip: before you copy the equation from Excel, you may consider enlarging its size by selecting it > Home > Change Font Size.