Приведите к наименьшему общему знаменателю дроби: 3/8 и 5/12; 2/15 и 3/10; 10/17 и 13/34; 4/13 и 3/4; 9/14 и 2/21; 1/20 и 1/30;1/9, 1/4 и 1/6; 2/28, 9/14 и 7/8

1) $frac{3}{8} = frac{3*3}{8*3} = frac{9}{24}$

   $frac{5}{12} = frac{5*2}{12*2} = frac{10}{24}$

2) $frac{2}{15} = frac{2*2}{15*2} = frac{4}{30}$

   $frac{3}{10} = frac{3*3}{10*3} = frac{9}{30}$

3) $frac{10}{17} = frac{10*2}{17*2} = frac{20}{34}$

   $frac{13}{34} = frac{13*1}{34*1} = frac{13}{34}$

4) $frac{4}{13} = frac{4*4}{13*4} = frac{16}{52}$

   $frac{3}{4} = frac{3*13}{4*13} = frac{39}{52}$

5) $frac{9}{14} = frac{9*3}{14*3} = frac{27}{42}$

   $frac{2}{21} = frac{2*2}{21*2} = frac{4}{42}$

6) $frac{1}{20} = frac{1*3}{20*3} = frac{3}{60}$

   $frac{1}{30} = frac{1*2}{30*2} = frac{2}{60}$

7) $frac{1}{9} = frac{1*4}{9*4} = frac{4}{36}$

   $frac{1}{4} = frac{1*9}{4*9} = frac{9}{36}$

   $frac{1}{6} = frac{1*6}{6*6} = frac{6}{36}$

8) $frac{2}{28} = frac{2*2}{28*2} = frac{4}{56}$

   $frac{9}{14} = frac{9*4}{14*4} = frac{36}{56}$

   $frac{7}{8} = frac{7*7}{8*7} = frac{49}{56}$