Respuestas

2013-12-24T17:10:50+01:00
Ab + a + b = ba
10a + b + a + b = 10b + a
11a + 2b =10b + a
10a = 8b
a/b = 8/10 = 4/5
Entonces:
45 + 4 + 5 = 54
Rpta: 4x5 = 20