Вы можете использовать MathJax .Пример сообщения Blogger: MathJax-тестирование
Просто добавьте следующий скрипт:
<script src="http://www.mathjax.org/MathJax/MathJax.js">
//
// This script call is what gets MathJax loaded and running
//
MathJax.Hub.Config({
// Only needed if to do more configuration within the page
delayStartupUntil: "onload",
// input is TeX and output is HTML-CSS
jax: ["input/MathML", "input/TeX", "output/HTML-CSS"], format
// use the tex2jax preprocessor
extensions: ["tex2jax.js"],
tex2jax: {
// uncomment to use $...$ for inline math
inlineMath: [['$','$'], ['\\(','\\)']],
// set to 1 to allow \$ to produce a dollar sign
processEscapes: 1
}
});
</script>