You can use L A T E X to typeset formulas. If you have inline code blocks. Enclose them by backticks then.
-Fpandoc-crossref --- a2 b2 c2 eqeqn1 log xy log x log y eqeqn2 frac df dt lim_ hto0frac f th-f t h eqeqn3.
Since I am writing blog post that hosted by Github with Editor Atom and use plugin markdown-preview-plus and mathjax-wrapper and use mathjax Javascript display the math symbols on the web page. This is an R Markdown document. Markdown Mode in Jupyter. For example the text this_ is inline will produce.