Приведите дроби к наименьшему общему знаменателю:
а) $\frac{5}{7}$ и $\frac{1}{2}$;
б) $\frac{7}{20}$ и $\frac{1}{15}$;
в) $\frac{3}{26}$ и $\frac{5}{39}$;
г) $\frac{8}{11}$ и $\frac{5}{8}$;
д) $\frac{7}{13}$ и $\frac{2}{11}$;
е) $\frac{6}{22}$ и $\frac{2}{33}$;
ж) $\frac{7}{60}, \frac{13}{540}$ и $\frac{9}{20}$;
з) $\frac{52}{105}, \frac{7}{95}$ и $\frac{61}{63}$.
НОК(7; 2) = 14
$\frac{5}{7} = \frac{5 * 2}{7 * 2} = \frac{10}{14}$;
$\frac{1}{2} = \frac{1 * 7}{2 * 7} = \frac{7}{14}$.
НОК(20; 15) = 60
$\frac{7}{20} = \frac{7 * 3}{20 * 3} = \frac{21}{60}$;
$\frac{1}{15} = \frac{1 * 4}{15 * 4} = \frac{4}{60}$.
НОК(26; 39) = 78
$\frac{3}{26} = \frac{3 * 3}{26 * 3} = \frac{9}{78}$;
$\frac{5}{39} = \frac{5 * 2}{39 * 2} = \frac{10}{78}$.
НОК(11; 8) = 88
$\frac{8}{11} = \frac{8 * 8}{11 * 8} = \frac{64}{88}$;
$\frac{5}{8} = \frac{5 * 11}{8 * 11} = \frac{55}{88}$.
НОК(13; 11) = 143
$\frac{7}{13} = \frac{7 * 11}{13 * 11} = \frac{77}{143}$;
$\frac{2}{11} = \frac{2 * 13}{11 * 13} = \frac{26}{143}$.
НОК(22; 33) = 66
$\frac{3}{22} = \frac{3 * 3}{22 * 3} = \frac{9}{66}$;
$\frac{2}{33} = \frac{2 * 2}{33 * 2} = \frac{4}{66}$.
НОК(60; 540; 20) = 540
$\frac{7}{60} = \frac{7 * 9}{60 * 9} = \frac{63}{540}$;
$\frac{13}{540} = \frac{13 * 1}{540 * 1} = \frac{13}{540}$;
$\frac{9}{20} = \frac{9 * 27}{20 * 27} = \frac{243}{540}$.
НОК(105; 95; 63) = 5985
$\frac{52}{105} = \frac{52 * 57}{105 * 57} = \frac{2964}{5985}$;
$\frac{7}{95} = \frac{7 * 63}{95 * 63} = \frac{441}{5985}$;
$\frac{61}{63} = \frac{61 * 95}{63 * 95} = \frac{5795}{5985}$.
Пожауйста, оцените решение