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=...