How to insert equations or formula while writing notes in Libre Office?

I have downloaded a pdf file from an other program in libre office It shows te equations completely wrong. What can i do? – user296824 Jun 22 '14 at 10:04

1LibreOffice Math Guide: wiki.documentfoundation.org/images/a/ae/… – Mukesh Chapagain Mar 20 '15 at 8:25

How to: solution: with your fingers ! – user610658 Aug 23 '18 at 7:24
The most basic answer to your question is Insert > Object > Formula
in LibreOffice Writer.

3Out of curiosity, do you have any idea why the math formula in libreoffice does not adapt Latex syntax? If it does then it's much easier to copy and use the countless, readilyavailable latex equations from the web! – user22363 Nov 30 '16 at 22:16
A more detailed answer: If you use this feature a lot (I'm a math teacher, I use it a lot!) you can add a button to the toolbar to take you directly to the formula editor. There is a GUI input method, but you can also use a sortof command line version where you enter the code for the expression as text in your document, then highlight it and select Insert Formula
. As an example, this
x={{b + sqrt{b^2 4ac}} over {2a}}
will turn into this
Here's the a screenshot: (Notice the first symbol on the tool bar  that's where I've place the Insert Equation
button.)
Alt+I, O, F comes handy
There after a formula editor panel will be displayed.
Once you finished press
Esc
it will close the formula editor
Install the TexMaths extension (Tools > Extension Manager). You will need to click on Get more extensions online... search for TexMaths in the online repository download and install (usually doubleclicking the file will open LibreOffice for installation). Restart LibreOffice and the TexMaths should appear in the toolbar.
Latex installation is also required:
sudo apt install texlive texlivebinaries dvipn
Please note that when you are using the TexMaths extension, you should always use the .odt format to save your files. Microsoft office does not support .svg
images.
Also configure TexMaths to use scalable vector graphics (.svg) with this format your equations will always print crisp/sharp no matter how big or small you make them on the page. Do not use .png as the print quality will never be as good as .svg.
Use the Dmaths addon, which enables you to type the equation directly into the text
e.g. : You would like to type an integral from a to b of f(x) dx, you just type " a;b;f(x) " ( without quotes ) and you type the shortcut "ctrl+shift+i" and there it is.
I'm a math teacher and this is how I type all the equations I need.
There's another addon that acts the same way called Cmath, but the first one is the most complete because you can also draw simple 3d figures, do plane geometry, and different other stuff.

You could add that it's not free (13 euros). Not that I'm against it but just to distinguish it from Libreoffice in general. Cmath is free by the way. – ThePhi Apr 15 '18 at 15:40
Formula bar will be grayed out and unclickable, until you install LibreOffice Math. It will "unlock" your formula bar. The Math icon cannot be found/placed on desktop or all application menu. It is used as extension to use formula bar. That's because the LibreOffice Math software is very useless  can only type some formulas,but not text and things from "insert" menu. But as I said, it "unlocks" formula bar from LibreOffice Write, Presentation, Calc and Draw.
So go to Ubuntu/Unity/Gnome Software (it depends on your operating system) and type "LibreOffice" . Than select "LibreOffice Math" from the suggested search bar. Then install it.
Your formula bar is now useable and clickable!
After you click it, you will see a some kind of LibreOffice Math, but inside LibreOffice Write, Calc, Presentation or Draw. By using operations in your right you make your own equation. The operators will make little boxes where you write letters and numbers.