Реши пропорции: 2) x:15=8:24

Решаю пропорции. 2) $x:15 = 8:24$ $x = (15 * 8) / 24 = 120 / 24 = 5$ **Ответ: x = 5** 4) $36:x = 54:3$ $x = (36 * 3) / 54 = 108 / 54 = 2$ **Ответ: x = 2** 6) $343 : 98 = x : 60$ $x = (343 * 60) / 98 = 210$ **Ответ: x = 210** 8) $72 : 40 = 324 : x$ $x = (40 * 324) / 72 = 180$ **Ответ: x = 180** 10) $x : 1\frac{3}{7} = 1\frac{3}{15} : 1\frac{1}{3}$ $x : \frac{10}{7} = \frac{18}{15} : \frac{4}{3}$ $x = \frac{10}{7} * \frac{18}{15} / \frac{4}{3} = \frac{10}{7} * \frac{18}{15} * \frac{3}{4} = \frac{9}{7}$ **Ответ: x = 9/7** 12) $0.38 : x = 4\frac{3}{4} : 1\frac{7}{8}$ $0.38 : x = \frac{19}{4} : \frac{15}{8}$ $x = 0.38 / (\frac{19}{4} / \frac{15}{8}) = 0.38 / (\frac{19}{4} * \frac{8}{15}) = 0.38 / (\frac{38}{15}) = 0.38 * \frac{15}{38} = 0.1 * 15 = 1.5 / 1 = 1.5$ **Ответ: x = 0.15** 14) $10.4 : 3\frac{5}{7} = x : \frac{5}{11}$ $10.4 : \frac{26}{7} = x : \frac{5}{11}$ $x = (10.4 * \frac{5}{11}) / \frac{26}{7} = 10.4 * \frac{5}{11} * \frac{7}{26} = \frac{10.4 * 5 * 7}{11 * 26} = \frac{364}{286} = \frac{182}{143} = \frac{14}{11}$ **Ответ: x = 14/11** 16) $1.25 : 1.4 = 0.75 : x$ $x = (1.4 * 0.75) / 1.25 = 0.84$ **Ответ: x = 0.84**