174. Решите уравнение: a) \frac{3}{8} : \frac{3}{11} = x : \frac{4}{11}; б) m:5 \frac{2}{3} = 1 \frac{7}{9} : \frac{7}{27}; в) 15,48 : 64,8 = 55,9 : y.

a) \frac{3}{8} : \frac{3}{11} = x : \frac{4}{11} \frac{3}{8} * \frac{11}{3} = x : \frac{4}{11} \frac{11}{8} = x : \frac{4}{11} x = \frac{11}{8} * \frac{4}{11} x = \frac{1}{2} б) m:5 \frac{2}{3} = 1 \frac{7}{9} : \frac{7}{27} m:\frac{17}{3} = \frac{16}{9} : \frac{7}{27} m:\frac{17}{3} = \frac{16}{9} * \frac{27}{7} m:\frac{17}{3} = \frac{16*3}{7} m = \frac{48}{7} * \frac{17}{3} m = \frac{16*17}{7} m = \frac{272}{7} m = 38 \frac{6}{7} в) 15,48 : 64,8 = 55,9 : y \frac{15,48}{64,8} = \frac{55,9}{y} y = \frac{55,9*64,8}{15,48} y = \frac{3622,32}{15,48} y = 234