- $$7 < 7 \frac{1}{3} < 8$$, $$7 \frac{1}{3} = \frac{7 \cdot 3 + 1}{3} = \frac{21+1}{3} = \frac{22}{3}$$
- $$7 < 7 \frac{1}{2} < 8$$, $$7 \frac{1}{2} = \frac{7 \cdot 2 + 1}{2} = \frac{14+1}{2} = \frac{15}{2}$$
- $$7 < 7 \frac{3}{4} < 8$$, $$7 \frac{3}{4} = \frac{7 \cdot 4 + 3}{4} = \frac{28+3}{4} = \frac{31}{4}$$
Ответ:
$$7 \frac{1}{3} = \frac{22}{3}; 7 \frac{1}{2} = \frac{15}{2}; 7 \frac{3}{4} = \frac{31}{4}$$