4. Решите уравнение: a) $$18\frac{2}{17} - (3\frac{5}{17} + x) = 5\frac{9}{17}$$; б) 2,7x - 1,84x + 5,87 = 8,88.

Решение: a) $$18\frac{2}{17} - (3\frac{5}{17} + x) = 5\frac{9}{17}$$ $$18\frac{2}{17} - 3\frac{5}{17} - x = 5\frac{9}{17}$$ $$15\frac{-3}{17} - x = 5\frac{9}{17}$$ $$14\frac{14}{17} - x = 5\frac{9}{17}$$ $$x = 14\frac{14}{17} - 5\frac{9}{17}$$ $$x = 9\frac{5}{17}$$ Ответ: $$9\frac{5}{17}$$ б) 2,7x - 1,84x + 5,87 = 8,88 0,86x + 5,87 = 8,88 0,86x = 8,88 - 5,87 0,86x = 3,01 x = 3,01 / 0,86 x = 3,5 Ответ: 3,5