I would say use MathJax. It's a AJAX engine for LaTeX syntax that now is distributed by a CDN so you don't have to upload a single file to your blogspot account.
To enable MathJax, just drop in
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/latest/MathJax.js">
MathJax.Hub.Config({
extensions: ["tex2jax.js","TeX/AMSmath.js","TeX/AMSsymbols.js"],
jax: ["input/TeX", "output/HTML-CSS"],
tex2jax: {
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
},
"HTML-CSS": { availableFonts: ["TeX"] }
});
</script>
after the header (<head>
) in the Blogger template (Design→Edit HTML→Edit Template).
Googling "install mathjax blogspot" led me to a page on the Web Applications StackExchange: MathJax on Blogger.
See the MathJax pages for more information about configuring and using it.
Best Answer
For math input one can use MathJax.
Quick instructions
For me it works to add:
to the header (which can be modified at a lot of blogging websites) of the html document.
After that you can use
$..$
and$$..$$
to quickly add inline and display style equations,\begin{..}...\end{..}
works too.This is how it looks and works also with different colors.