2. Решите уравнение: a) -7,12x = -24,92; б) 15,471 : x = -3,82; в) 3,5/(-x) = -5,6/-4,5.

Решение: a) $$-7,12x = -24,92$$ $$x = \frac{-24,92}{-7,12} = \frac{24,92}{7,12} = 3,5$$ б) $$15,471 : x = -3,82$$ $$x = \frac{15,471}{-3,82} = -4,05$$ в) $$\frac{3,5}{-x} = \frac{-5,6}{-4,5}$$ $$\frac{3,5}{-x} = \frac{5,6}{4,5}$$ $$5,6 \cdot (-x) = 3,5 \cdot 4,5$$ $$-5,6x = 15,75$$ $$x = \frac{15,75}{-5,6} = -2,8125$$ Ответ: a) x = 3,5 б) x = -4,05 в) x = -2,8125