https://www.thinglink.com/scene/717107300950605826
próbadolgozat: https://redmenta.com/?solve&ks_id=1818095353
szövegmagyarázat: https://learningapps.org/display?v=p8urihh2c15
keresztrejtvény: https://learningapps.org/display?v=p47chgf5j18
https://learningapps.org/display?v=pip1pha0c18
gyakorló feladatok: https://learningapps.org/display?v=p7omnzcm317
