arabera DEISY MABEL GUERRERO ARIZA 10 years ago
4683
Honelako gehiago
by diego sanchez garcia
by roxana rios
by johnny alberto toro caro
by Itziar Echeandía
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)