arabera DEISY MABEL GUERRERO ARIZA 9 years ago
4592
Honelako gehiago
by Diana Marcela Garcia Ocampo
by Cristian Parra
by johnny alberto toro caro
by A Fidalgo
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)