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Ответ: 1) 2 4/9; 2) 1 7/15; 3) 5/2; 4) 177/40; 5) 41/8; 6) 3 1/4.

Пошаговое объяснение: 1) 2 7/9-1/3= 25/9 - 1/3 = 25/9 -3/9 = 22/9 = 2 4/9;

2) 3 4/5 - 2/3= 19/5 - 2/3 = 57/15 - 35/15 = 22/ 15 = 1 7/15;

3) 4 5/6 - 2 1/3= 29/6 - 7/3 = 29/6 -14/6= 15/6 = 5/2;

4) 6 4/5- 2 3/8= 34/5 - 19/8 = 272/40 - 95/40 = 177/40;

5) 9 1/2 - 4 3/8 = 19/2 - 35/8 = 76/8 - 35/8 = 41/8;

6) 8 19/20 - 5 7/10 = 179/20 - 57/10 = 179/20 - 114/20 = 65/20 = 3 1/4.