Помагите решить примеры: в) и г)

Решите задачу:

$\frac{17}{18} ( - 1 \frac{4}{7}) - ( - \frac{4}{21})( - 1 \frac{1}{6}) = \frac{17}{18}( - \frac{11}{7}) - ( - \frac{4}{21})( - \frac{7}{6}) = - \frac{187}{126} - \frac{2}{3} = - \frac{187}{126} - \frac{84}{126} = - \frac{271}{126} = - 2 \frac{19}{126}$

$( - 1 \frac{7}{8} - 1 \frac{4}{5} + \frac{9}{16})( - \frac{8}{9}) = ( - \frac{15}{8} - \frac{9}{5} + \frac{9}{16} )( - \frac{8}{9}) = ( - \frac{150}{80} - \frac{144}{80} + \frac{45}{80})( - \frac{8}{9}) = ( - \frac{249}{80})( - \frac{8}{9}) = \frac{83}{30} = 2 \frac{23}{30}$