If you’re familiar with LaTeX, then LyX is a front-end of it. LyX provide a graphic interface in which we can easily write documents without any problem with LaTeX syntax/package. Plus, you can use your *.tex files in LyX. LyX is efficient for mathematical documents.
Download LyX: http://www.lyx.org/
Tutorial: http://heather.cs.ucdavis.edu/~matloff/lyx.html and http://wiki.lyx.org/LyX/LyX
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Ha ha, very great, thanx for sharing Mẫn