Заполните пропуски: (1)5/12-9/10=(1).../60-.../60=85\60-54/60=.../... (9)1/2-(5)9/17=(9).../...-(5).../...=(...).../...-(5).../...=(...).../... (3)4/7-(1)7/9=(3)36/63-(1)49/63=... (7)3/8-(2)5/6=(7)9/24-(2)20/24=...
25/60-54/60.......=31/60,