Funciones

https://www.youtube.com/watch?v=2fcVf2BGFX0


https://www.youtube.com/watch?v=Ll7xfe3HoZE&list=PLeySRPnY35dGfEuNGbQmymhiQF4oTUIMb

https://www.youtube.com/watch?v=x5BaQRIbeOU

https://www.youtube.com/watch?v=q_1biof0PLs&t=180s

https://www.youtube.com/watch?v=7av0wVoARIA
ejercicios 
https://www.youtube.com/watch?v=onh9C8dv9x4&t=7s


https://www.youtube.com/watch?v=PD45s3U9WA0&feature=share

https://www.youtube.com/watch?v=onh9C8dv9x4&t=7s