3. Решить уравнения: A) x-7/9=7/12 Б) 11/12-y=7/24

Решим уравнения:

1. A) $$x - \frac{7}{9} = \frac{7}{12}$$ $$x = \frac{7}{12} + \frac{7}{9}$$ $$x = \frac{7 \cdot 3}{12 \cdot 3} + \frac{7 \cdot 4}{9 \cdot 4}$$ $$x = \frac{21}{36} + \frac{28}{36}$$ $$x = \frac{21+28}{36}$$ $$x = \frac{49}{36}$$ $$x = 1\frac{13}{36}$$
2. Б) $$\frac{11}{12} - y = \frac{7}{24}$$ $$y = \frac{11}{12} - \frac{7}{24}$$ $$y = \frac{11 \cdot 2}{12 \cdot 2} - \frac{7}{24}$$ $$y = \frac{22}{24} - \frac{7}{24}$$ $$y = \frac{22-7}{24}$$ $$y = \frac{15}{24}$$ $$y = \frac{5}{8}$$

Ответ: A) $$x = 1\frac{13}{36}$$; Б) $$y = \frac{5}{8}$$