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a. -2,8... = - (2 + 0,8...) = - (2 + 8/9) = -26/9
b. -12,4545.. = - (12 + 0,4545..) = -(12 + 45/99) = -137/11
c. 0,121121... = 121/999
d. -6,3544... = -(6 + 0,3544..) = -[6 + (354 - 35)/900] = -5719/900
e. 35,6123123... = 35 + (6123 - 6)/9990 = 118589/3330
f. - 0,812 = - 812/1000 = - 203/250 (suponiendo que no es periódico)
Si es periódico de período 812, resulta: - 0,812 = - 812/999
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