arabera DEISY MABEL GUERRERO ARIZA 10 years ago
4800
Honelako gehiago
by Keyly Alvarez Rangel
by Juan David Collazos Vargas
by Carolina Morocho
by Sandra Rosana Vedani Stanco
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)