1198. Решите уравнения: 1) 3\(\frac{1}{5}\)x + 2,9x = 36,6; 2) 5,6x - 2,4x = 4,8; 3) 9x-\(\frac{7}{20}\)x = 4,03; 4) (x + 2,6): 0,8 = 7,45; 5) (7,8-y): 6,1 = 0,2; 6) 16,5: (7,6 - y) = 5.

Ответы: 1) x = 7.5; 2) x = 1.5; 3) x = 0.46; 4) x = 3.36; 5) y = 6.58; 6) y = 4.3

1. Решим уравнение 1: 3\(\frac{1}{5}\)x + 2,9x = 36,6 \(3\frac{1}{5}x + 2.9x = 36.6\) \(3.2x + 2.9x = 36.6\) \(6.1x = 36.6\) \(x = \frac{36.6}{6.1}\) \(x = 6\)
2. Решим уравнение 2: 5,6x - 2,4x = 4,8 \(5.6x - 2.4x = 4.8\) \(3.2x = 4.8\) \(x = \frac{4.8}{3.2}\) \(x = 1.5\)
3. Решим уравнение 3: 9x-\(\frac{7}{20}\)x = 4,03 \(9x - \frac{7}{20}x = 4.03\) \(9x - 0.35x = 4.03\) \(8.65x = 4.03\) \(x = \frac{4.03}{8.65}\) \(x = 0.46\)
4. Решим уравнение 4: (x + 2,6): 0,8 = 7,45 \((x + 2.6) : 0.8 = 7.45\) \(x + 2.6 = 7.45 \times 0.8\) \(x + 2.6 = 5.96\) \(x = 5.96 - 2.6\) \(x = 3.36\)
5. Решим уравнение 5: (7,8-y): 6,1 = 0,2 \((7.8 - y) : 6.1 = 0.2\) \(7.8 - y = 0.2 \times 6.1\) \(7.8 - y = 1.22\) \(y = 7.8 - 1.22\) \(y = 6.58\)
6. Решим уравнение 6: 16,5: (7,6 - y) = 5 \(16.5 : (7.6 - y) = 5\) \(7.6 - y = \frac{16.5}{5}\) \(7.6 - y = 3.3\) \(y = 7.6 - 3.3\) \(y = 4.3\)

Ответы: 1) x = 6; 2) x = 1.5; 3) x = 0.46; 4) x = 3.36; 5) y = 6.58; 6) y = 4.3