Επανάληψη στα Κεφάλαια 13 -21

https://anoixtosxoleio.weebly.com/epsilonnu972tauetataualpha-31.html

https://atheo.gr/yliko/math/kla/interaction.html

http://www.daskalosa.eu/maths_e_ergasies/%CE%9C%CE%B1%CE%B8%CE%B7%CE%BC%CE%B1%CF%84%CE%B9%CE%BA%CE%AC_%CE%95_%CE%B5%CF%80%CE%B1%CE%BD%CE%B1%CE%BB%CE%B7%CF%80%CF%84%CE%B9%CE%BA%CF%8C_3_%CE%9A%CE%B5%CF%86%CE%AC%CE%BB%CE%B1%CE%B9%CE%B1_13-21.pdf