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Ponemos a fracción los decimales periódicos puros:
0,888... = (8 - 0)/9 = 8/9
2,444... = (24 - 2)/9 = 22/9
Reemplazamos:
8/9 + 22/9 - 1/2
(8 + 22)/9 - 1/2 = 30/9 - 1/2
(Simplificamos 30/9)
10/3 - 1/2
Regla del aspa para sumar dos fracciones heterogéneas:
(10*2 + 3*1)/(3*2)
(20 + 3)/6
23/6