Răspuns :
▪20 + 4 = 24 / 24 - 4 = 20 / 24 - 20 = 4
▪10 + 7 = 17 / 17 - 7 = 10 / 17 - 10 = 7
▪9 + 10 = 19 / 19 - 10 = 9 / 19 - 9 = 10
▪6 + 20 = 26 / 26 - 20 = 6 / 26 - 6 = 20
▪10 + 7 = 17 / 17 - 7 = 10 / 17 - 10 = 7
▪9 + 10 = 19 / 19 - 10 = 9 / 19 - 9 = 10
▪6 + 20 = 26 / 26 - 20 = 6 / 26 - 6 = 20