Пошаговое объяснение:
1. (12) = 1 12/99 = 1 4/33
1 4/33
1,(12) = (1,12*100 - 1)/(100-1) = (112-1)/99 = 111/99 = 37/33 = 1 4/33
1 4/33 = 37/33 = 37:33 = 1, 12121212 = 1,(12)
