What is the standard way to include math equations in a CS research paper?
If you can write in latex, you should write on it versus word. The latex is specially designed to work with technical documents with a lot of mathematical equations. 

Also, you can write math equations in word using built-in equation editor of Microsoft word or MathType as a better alternative than built-in ones. 
See this link for word equation for equation writing in Word with better configuration. 

Technically the MathType produces equations with higher equality than Word built-in and I recommend it to use as a macro on Word.

About writing in Latex and then revert to Word, it wouldn't be recommended and will be reduced the quality of equations (due to reversion complexities and equation editors' of Word difficulties).