NА. Решите уравнение: 1) 77-(511-y)-319; 30 30 30 2) (x-19)+214=55.

Решим уравнения:

1. $$7\frac{7}{30} - (5\frac{11}{30} - y) = 3\frac{19}{30}$$

   $$7\frac{7}{30} - 5\frac{11}{30} + y = 3\frac{19}{30}$$

   $$y = 3\frac{19}{30} - 7\frac{7}{30} + 5\frac{11}{30}$$

   $$y = 8\frac{30}{30} - 7\frac{7}{30}$$

   $$y = 1\frac{23}{30}$$

   Ответ: $$1\frac{23}{30}$$

2. $$(x - 1\frac{9}{17}) + 2\frac{14}{17} = 5\frac{5}{17}$$

   $$x - 1\frac{9}{17} = 5\frac{5}{17} - 2\frac{14}{17}$$

   $$x - 1\frac{9}{17} = 4\frac{22}{17} - 2\frac{14}{17}$$

   $$x - 1\frac{9}{17} = 2\frac{8}{17}$$

   $$x = 2\frac{8}{17} + 1\frac{9}{17}$$

   $$x = 3\frac{17}{17}$$

   $$x = 4$$

   Ответ: 4