Séptimo año :Proporcionalidad

https://www.youtube.com/watch?v=1uAbIb-McLo

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

https://www.youtube.com/watch?v=uTbe8I5IEgk&t=12s

https://www.youtube.com/watch?v=o0DL20Os34k

https://www.youtube.com/watch?v=gEQWnRrtz34