Răspuns :
a + a + 1 + a + 2 = 636
3a = 636 - 3
a = 633 : 3
a = 211
a + 1 = 211 + 1 = 212
a + 2 = 211 + 2 = 213
3a = 636 - 3
a = 633 : 3
a = 211
a + 1 = 211 + 1 = 212
a + 2 = 211 + 2 = 213