Вычислите:
а) $\frac{1}{15} * 1,5$;
б) $(-0,26) : (-\frac{39}{50})$;
в) $5,1 * (-\frac{5}{17})$;
г) $(-\frac{19}{20}) : 3,8$;
д) $4,5 * (-\frac{7}{15})$;
е) $(-\frac{27}{50}) : (-0,81)$.
$\frac{1}{15} * 1,5 = \frac{1}{15} * \frac{15}{10} = \frac{1}{1} * \frac{1}{10} = 0,1$
$(-0,26) : (-\frac{39}{50}) = \frac{26}{100} : \frac{39}{50} = \frac{13}{50} * \frac{50}{39} = \frac{1}{1} * \frac{1}{3} = \frac{1}{3}$
$5,1 * (-\frac{5}{17}) = \frac{51}{10} * (-\frac{5}{17}) = \frac{3}{2} * (-\frac{1}{1}) = -1,5$
$(-\frac{19}{20}) : 3,8 = (-\frac{19}{20}) : \frac{38}{10} = (-\frac{19}{20}) : \frac{19}{5} = (-\frac{19}{20}) * \frac{5}{19} = (-\frac{1}{4}) * \frac{1}{1} = -0,25$
$4,5 * (-\frac{7}{15}) = \frac{45}{10} * (-\frac{7}{15}) = \frac{9}{2} * (-\frac{7}{15}) = \frac{3}{2} * (-\frac{7}{5}) = -\frac{21}{10} = -2,1$
$(-\frac{27}{50}) : (-0,81) = \frac{27}{50} : \frac{81}{100} = \frac{27}{50} * \frac{100}{81} = \frac{1}{1} * \frac{2}{3} = \frac{2}{3}$
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