6. Решите уравнение: а) \(x: 6 = 20:40\), б) \(\frac{x}{9} = \frac{7}{2}\)

а) \(x: 6 = 20:40\) \(x : 6 = \frac{20}{40}\) \(x : 6 = \frac{1}{2}\) \(x = 6 \cdot \frac{1}{2}\) \(x = 3\) б) \(\frac{x}{9} = \frac{7}{2}\) \(x = \frac{7}{2} \cdot 9\) \(x = \frac{63}{2}\) \(x = 31,5\) Ответ: а) 3; б) 31,5