2. Решите уравнение: 1) 3\(\frac{3}{4}\)x = x-1\(\frac{1}{4}\) 2) 3x = -81

Решение:

1. \(3\frac{3}{4}x = x - 1\frac{1}{4}\)
• \(\frac{15}{4}x = x - \frac{5}{4}\)
• \(\frac{15}{4}x - x = -\frac{5}{4}\)
• \(\frac{15}{4}x - \frac{4}{4}x = -\frac{5}{4}\)
• \(\frac{11}{4}x = -\frac{5}{4}\)
• \(11x = -5\)
• \(x = -\frac{5}{11}\)
2. \(3x = -81\)
• \(x = \frac{-81}{3}\)
• \(x = -27\)

Ответ: 1) \(x = -\frac{5}{11}\); 2) \(x = -27\).