Вычислите смешанные дроби 8 9/16 - 3 5/16; 7 18/25 - 7 8/25

5 4дробь16=5 1дроб4; 10дробь25=2дробь5

1.
8 9/16 - 3 5/16 = (8 - 3) + (9/16 - 5/16) = 5 + 4/16 = 5 1/4
ИЛИ 
8 9/16 - 3 5/16 = 137/16 - 53/16 = 84/16 = 5 1/4;
2.
7 18/25 - 7 8/25 = (7 - 7) + (18/25 - 8/25) = 10/25 = 2/5
ИЛИ 
7 18/25 - 7 8/25 = 193/25 - 183/25 = 10/25 = 2/5