Your contribution cannot be approved because it does not refer to or relate to an open-source repository. See here for a definition of "open-source."
This is basic mathematics. It does not provide value to the software.
Further:
End-user focused tutorials must address a minimum of three substantial concepts that are unique to the Open Source project and essential learning requirements for end-users. Preference is given to tutorials that are part of a curriculum (series) of tutorials all of which are sequential and built on previously learned skills and knowledge.
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[utopian-moderator]
RE: Tutorial 1: Creación, Propiedades y Operaciones Básicas con Matrices.