arabera DEISY MABEL GUERRERO ARIZA 10 years ago
4854
Honelako gehiago
Maria Paula Garcia Forero‑k egina
gerson perez camacho‑k egina
joaquin leanza‑k egina
Nidia Pérez‑k egina
a + 0 = a b + 0 = b c + 0 = c
a + b = c y b+ a = c
(a + b) + c = a + (b + c)