4.334 Найдите корень уравнения: a) -7,42z = 70,49; б) z: (-4,04) = −8,5; в) 9,43 (-с) = 22,632; г) -4/7c = 9/14; д) -3,7-(-n) = e) 7/9n = -0,63

a) $$-7.42z = 70.49$$ $$z = \frac{70.49}{-7.42}$$ $$z = -9.5$$ б) $$z : (-4.04) = -8.5$$ $$z = -8.5 \cdot (-4.04)$$ $$z = 34.34$$ в) $$9.43 \cdot (-c) = 22.632$$ $$-c = \frac{22.632}{9.43}$$ $$-c = 2.4$$ $$c = -2.4$$ г) $$-\frac{4}{7}c = \frac{9}{14}$$ $$c = \frac{9}{14} : (-\frac{4}{7})$$ $$c = \frac{9}{14} \cdot (-\frac{7}{4})$$ $$c = -\frac{9 \cdot 7}{14 \cdot 4}$$ $$c = -\frac{9}{2 \cdot 4}$$ $$c = -\frac{9}{8}$$ $$c = -1.125$$ д) $$-3.7 \cdot (-n) = ? $$ - Нет уравнения e) $$\frac{7}{9}n = -0.63$$ $$n = -0.63 : \frac{7}{9}$$ $$n = -0.63 \cdot \frac{9}{7}$$ $$n = -0.09 \cdot 9$$ $$n = -0.81$$ Ответ: a) **z = -9.5** б) **z = 34.34** в) **c = -2.4** г) **c = -1.125** д) *Нет уравнения* e) **n = -0.81**