в) \frac{64}{131} : \frac{32}{52} = \frac{64}{131} \cdot \frac{52}{32} = \frac{64 \cdot 52}{131 \cdot 32} = \frac{2 \cdot 32 \cdot 4 \cdot 13}{131 \cdot 32} = \frac{2 \cdot 4 \cdot 13}{131} = \frac{8 \cdot 13}{131} = \frac{104}{131}
Ответ: \frac{104}{131}