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2/5 + 1/9 + 1 = El mcm de los denominadores 5 y 9 es = 45
(2 * 9)/45 + (1 * 5)/45 + 45/45 =
18/45 + 5/45 + 45/45 =
(18 + 5 + 45)/45 =
68/45
Respuesta.
68/45