6.25 8) 35-7

8) $$\frac{6 \cdot 25}{35 \cdot 7} = \frac{6 \cdot 25}{35 \cdot 7} = \frac{6 \cdot 5}{7 \cdot 7} = \frac{30}{49}$$

Ответ: $$\frac{30}{49}$$