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0.3 periodico seria 3/9
1.23 semiperiodico seria 111/90
El ejercicio quedaria
1-2*3/9-111/90
1-6/9-111/90
1-2/3-111/90 /m.c.m. 90
90/90-60/90-111/90
-81/90
-9/10 = -0.9
Respuesta C