197. Амалдарды аткаргыла:

a) \(\frac{3,25 + 2\frac{1}{2}}{2\frac{1}{2} - 1,875} = \frac{3,25 + 2,5}{2,5 - 1,875} = \frac{5,75}{0,625} = 9,2\)
б) \(\frac{5,5 + 1\frac{4}{7}}{5,5 - 1\frac{4}{7}} : \frac{1\frac{1}{7} + \frac{4}{21}}{1\frac{1}{7} - \frac{4}{21}} = \frac{5,5 + \frac{11}{7}}{5,5 - \frac{11}{7}} : \frac{\frac{25}{21}}{\frac{17}{21}} = \frac{\frac{38,5 - 11}{7}}{\frac{38,5 - 11}{7}} : \frac{25}{17} = \frac{27,5}{27,5} : \frac{25}{17} = 1 : \frac{25}{17} = \frac{17}{25} = 0,68\)
в) \(\frac{2\frac{2}{3} - 2\frac{1}{2} - 1,25}{6\frac{3}{8} - 1\frac{1}{4} : \frac{5}{18}} = \frac{\frac{8}{3} - \frac{5}{2} - \frac{5}{4}}{\frac{51}{8} - \frac{5}{4} \cdot \frac{18}{5}} = \frac{\frac{32 - 30 - 15}{12}}{\frac{51}{8} - \frac{9}{2}} = \frac{-\frac{13}{12}}{\frac{51 - 36}{8}} = \frac{-\frac{13}{12}}{\frac{15}{8}} = -\frac{13}{12} \cdot \frac{8}{15} = -\frac{13 \cdot 2}{3 \cdot 15} = -\frac{26}{45}\)
г) \(\frac{(0,3 - \frac{2}{20}) \cdot 1\frac{1}{2}}{(1,77 + 2\frac{3}{25}) \cdot \frac{1}{8}} = \frac{(0,3 - 0,1) \cdot 1,5}{(1,77 + 2,12) \cdot 0,125} = \frac{0,2 \cdot 1,5}{3,89 \cdot 0,125} = \frac{0,3}{0,48625} \approx 0,617\)