Вычислите. 1) 1 - 13/21 = ?/21 - 13/21 = 2) 4 - 2/9 - 3(?/9) - 2/9 = 3) 7 - 1(13/16) = 4) 10 - 5(3/7) =

1) 1 - 13/21 = 21/21 - 13/21 = 8/212) 4 - 2/9 - 3(9/9) - 2/9 = 3(7/9)3) 7 - 1(13/16) = 5(3/16)4) 10 - 5(3/7) = 1(4/7)