Вычислите:
а) $\frac{25}{28} - \frac{18}{35}$;
б) $\frac{40}{63} - \frac{35}{72}$;
в) $\frac{22}{21} - \frac{21}{22}$;
г) $\frac{40}{143} - \frac{41}{156}$;
д) $\frac{43}{126} - \frac{41}{135}$;
е) $\frac{239}{240} - \frac{229}{288}$.
$\frac{25}{28} - \frac{18}{35} = \frac{125 - 72}{140} = \frac{53}{140}$
$\frac{40}{63} - \frac{35}{72} = \frac{320 - 245}{504} = \frac{75}{504} = \frac{25 * 3}{168 * 3} = \frac{25}{168}$
$\frac{22}{21} - \frac{21}{22} = \frac{484 - 441}{462} = \frac{43}{462}$
$\frac{40}{143} - \frac{41}{156} = \frac{480 - 451}{1716} = \frac{29}{1716}$
$\frac{43}{126} - \frac{41}{135} = \frac{645 - 574}{1890} = \frac{71}{1890}$
$\frac{239}{240} - \frac{229}{288} = \frac{1434 - 1145}{1440} = \frac{289}{1440}$
Пожауйста, оцените решение
