3. Решите уравнение: 1)\(\frac{14}{25}\)x = \(\frac{7}{15}\); 2) -9:x=- \(\frac{27}{28}\).

Ответ: 1) x = \(\frac{5}{6}\); 2) x = \(\frac{28}{3}\)

1. \(\frac{14}{25}\)x = \(\frac{7}{15}\)
   x = \(\frac{7}{15}\) : \(\frac{14}{25}\)
   x = \(\frac{7}{15}\) \(\cdot\) \(\frac{25}{14}\)
   x = \(\frac{7\cdot25}{15\cdot14}\)
   x = \(\frac{175}{210}\)
   x = \(\frac{5}{6}\)
2. -9:x=- \(\frac{27}{28}\)
   x = -9 : (- \(\frac{27}{28}\))
   x = -9 \(\cdot\) (- \(\frac{28}{27}\))
   x = \(\frac{9\cdot28}{27}\)
   x = \(\frac{252}{27}\)
   x = \(\frac{28}{3}\)

Ответ: 1) x = \(\frac{5}{6}\); 2) x = \(\frac{28}{3}\)