arabera DEISY MABEL GUERRERO ARIZA 9 years ago
4556
Honelako gehiago
by anileth bernal
by diego sanchez garcia
by Hermes Emanuel Roa Lopez
by Juan David Collazos Vargas
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)