$40 = 2^3 * 5$;
$55 = 5 * 11$;
$88 = 2^3 * 11$;
$НОК(40;55;88) = 2^3 * 5 * 11 = 8 * 55 = 440$;
$\frac{3}{40} = \frac{11 * 3}{11 * 40} = \frac{33}{440}$;
$\frac{7}{55} = \frac{8 * 7}{8 * 55} = \frac{56}{440}$;
$\frac{9}{88} = \frac{5 * 9}{5 * 88} = \frac{45}{440}$.

$18 = 2 * 3^2$;
$12 = 2^2 * 3$;
15 = 3 * 5.
$НОК(12;15;18) = 2^2 * 3^2 * 5 = 4 * 9 * 5 = 36 * 5 = 180$;
$\frac{11}{18} = \frac{10 * 11}{10 * 18} = \frac{110}{180}$;
$\frac{7}{12} = \frac{15 * 7}{15 * 12} = \frac{105}{180}$;
$\frac{8}{15} = \frac{12 * 8}{12 * 15} = \frac{96}{180}$.

$64 = 2^6$;
$52 = 2^2 * 13$;
$91 = 7 * 13$;
$НОК(52;64;91) = 2^6 * 7 * 13 = 64 * 91 = 5824$;
$\frac{1}{64} = \frac{91 * 1}{91 * 64} = \frac{91}{5824}$;
$\frac{1}{52} = \frac{112 * 1}{112 * 52} = \frac{112}{5824}$;
$\frac{1}{91} = \frac{64 * 1}{64 * 91} = \frac{64}{5824}$.

$72 = 2^3 * 3^2$;
$48 = 2^4 * 3$;
$108 = 2^2 * 3^3$;
$НОК(48;72;108) = 2^4 * 3^3 = 16 * 27 = 432$;
$\frac{1}{72} = \frac{6 * 1}{6 * 72} = \frac{6}{432}$;
$\frac{1}{48} = \frac{9 * 1}{9 * 48} = \frac{9}{432}$;
$\frac{1}{108} = \frac{4 * 1}{4 * 108} = \frac{4}{432}$.

$20 = 2^2 * 5$;
$30 = 2 * 3 * 5$;
$45 = 3^2 * 5$;
$НОК(20;30;45) = 2^2 * 3^2 * 5 = 4 * 45 = 180$;
$\frac{7}{20} = \frac{9 * 7}{9 * 20} = \frac{63}{180}$;
$\frac{11}{30} = \frac{6 * 11}{6 * 30} = \frac{66}{180}$;
$\frac{8}{45} = \frac{4 * 8}{4 * 45} = \frac{32}{180}$.

$51 = 3 * 17$;
$34 = 2 * 17$;
$6 = 2 * 3$;
НОК(6;34;51) = 2 * 3 * 17 = 6 * 17 = 102;
$\frac{5}{51} = \frac{2 * 5}{2 * 51} = \frac{10}{102}$;
$\frac{9}{34} = \frac{3 * 9}{3 * 34} = \frac{27}{102}$;
$\frac{1}{6} = \frac{17 * 1}{17 * 6} = \frac{17}{102}$.