Ответ:
Решение:
- \( \left( \frac{7}{20} + \frac{13}{30} \right) \cdot 50 = \frac{7}{20} \cdot 50 + \frac{13}{30} \cdot 50 = \frac{7 \cdot 5}{2} + \frac{13 \cdot 5}{3} = \frac{35}{2} + \frac{65}{3} = \frac{35 \cdot 3 + 65 \cdot 2}{6} = \frac{105 + 130}{6} = \frac{235}{6} \)
- \( 60 \cdot \left( \frac{3}{5} - \frac{6}{15} \right) = 60 \cdot \frac{3}{5} - 60 \cdot \frac{6}{15} = 12 \cdot 3 - 4 \cdot 6 = 36 - 24 = 12 \)
- \( \left( 8 - 2 \frac{9}{14} \right) \cdot 32 = \left( 8 - \frac{37}{14} \right) \cdot 32 = \left( \frac{112 - 37}{14} \right) \cdot 32 = \frac{75}{14} \cdot 32 = \frac{75 \cdot 16}{7} = \frac{1200}{7} \)
Ответ: 1) \( \frac{235}{6} \) 2) 12 3) \( \frac{1200}{7} \)
