arabera DEISY MABEL GUERRERO ARIZA 10 years ago
4703
Honelako gehiago
by Vicente Lavandero Ivelic
by Santiago Duarte
by Deisy Yolanda Amortegui Sanchez
by Cristian Parra
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)