Решите уравнение: a) 1,8 * y = -3,69; б) -4,6 : x = -23; в) 11/15 * y + 9/10 = 8/15

Решение: a) $$1.8y = -3.69$$ $$y = -3.69 : 1.8$$ $$y = -2.05$$ б) $$-4.6 : x = -23$$ $$x = -4.6 : (-23)$$ $$x = 0.2$$ в) $$\frac{11}{15}y + \frac{9}{10} = \frac{8}{15}$$ $$\frac{11}{15}y = \frac{8}{15} - \frac{9}{10}$$ $$\frac{11}{15}y = \frac{16}{30} - \frac{27}{30}$$ $$\frac{11}{15}y = -\frac{11}{30}$$ $$y = -\frac{11}{30} : \frac{11}{15}$$ $$y = -\frac{11}{30} \cdot \frac{15}{11}$$ $$y = -\frac{1}{2}$$ Ответы: a) y = -2.05 б) x = 0.2 в) y = -0.5