ВЫПОЛНИТЕ ДЕЙСТВИЯ ДРОБИ 6 КЛАСС

А) 9 5/21 - (10 2/3 - 3 5/28) =
= 9 5/21 - ( 10 56/84 - 3 15/84) =
= 9 5/21 - 7 41/84 =
= 9 20/84 - 7 41/84 =
= 8 + 84/84 + 20/84 - 7 41/84 =
= 8 + 104/84 - 7 41/84 = 1 63/84 = 1 3/4

б) 6 13/15 + 3 7/12 - 4 9/20 =
= 6 52/60 + 3 35/60 - 4 27/60 =
= 5 + 60/60 = 5 + 1 = 6