3. Решите уравнение: a) $$\frac{11}{12} - y = \frac{11}{24}$$; б) 5,86m + 1,4m = 76,23.

3. а) $$\frac{11}{12} - y = \frac{11}{24}$$ $$y = \frac{11}{12} - \frac{11}{24} = \frac{11 \cdot 2}{12 \cdot 2} - \frac{11}{24} = \frac{22}{24} - \frac{11}{24} = \frac{11}{24}$$ Ответ: $$y = \frac{11}{24}$$ б) $$5,86m + 1,4m = 76,23$$ $$7,26m = 76,23$$ $$m = \frac{76,23}{7,26} = \frac{7623}{726} = 10,5$$ Ответ: $$m = 10,5$$