Q:

Write an equation, but I have a word with an accent

I want to write this equation: Peso fibra=(1,266x500)/(média 3 pesos)
I used the equation environment. But, the word "média" has an accent. So, I have problems to compile my main file.
How I can resolve this problem?

A:

I'm not sure I understand what you want but maybe the following is what you are after:
\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{equation}
  \text{Peso fibra}
  = (1{,}266 \times 500)/(\text{m\'edia 3 pesos})
\end{equation}

\end{document}

