What are you asking for?
i need to put the formula like the picture loaded not like sublime does right nowthanks for take your time...
This package might help you. I don't know, since I don't use it.
Mathjax won't do what you say you want, but it's great if you know how to write the formulas in a TeX language for display/rendering in browsers.
thanks.I need offline app! sorry
You didn't say what you wanted, but if you want offline, there is LibreOffice Math, and possibly others, Do a Google search.