Alternative to the use of mathematical equations in Android

Because of the great difficulties with mathematical equations I had a trick I use on Android (Note that all these equations are only text, not the algebraic properties)

Writing in Word -> Convert to PDF -> then converted into picture

I want to put the images into Mysql server and download them into Android applications. I do not want users to have access image   I put them into the database. The cost of these actions are high, but to my mind, not the other way

If there's one that is easier to please help