Выполни действие 8,1\5+2,4\5-3; 9,1\6+3,5\18; 10,5\8-2,7\16

Вычислим значения выражений

1) 8 1/5 + 2 4/5 - 3 = 8 + 1/5 + 2 + 4/5 - 3 = 10 + 1/5 + 4/5 - 3 = 10 - 3 + (1 + 4)/5 = 7 + 5/5 = 7 + 1 = 8; 

2) 9 1/6 + 3 5/18 = 9 + 1/6 + 3 + 5/18 = 12 + 1/6 + 5/18 = 12 + (1 * 3 + 5)/18 = 12 + (3 + 5)/15 = 12 + 8/18 = 12 + 4/9 = 2 4/9;

3) 10 5/8 - 2 7/16 = 10 + 5/8 - 2 - 7/16 = 8 + 5/8 - 7/16 = 8 + (5 * 2 - 7)/16 = 8 + (14 - 7)/16 = 8 + 7/16 = 8 7/16.