Question

Срочно помогите!!!
3 столбик.

Answer 1

11/20 - 5/12 = 33/60 - 25/60 = 8/60 = 2/15
8/9 + 7/54 = 48/54 + 7/54 = 55/54 = 1 1/54
5/6 - 17/21 = 35/42 - 34/42 = 1/42
3/16 + 1/24 = 9/48 + 2/48 = 11/48
7/25 - 4/15 = 21/75 - 20/75 = 1/75
3/10 + 1/6 = 9/30 + 5/30 = 14/30 = 7/15
2/5 - 11/30 = 12/30 - 11/30 = 1/30
3/8 + 7/20 = 15/40 + 14/40 = 29/40
1/6 - 1/7 = 7/42 - 6/42 = 1/42 

Answer 2

$frac{11}{20}- frac{5}{12}= frac{33}{60}- frac{25}{60}= frac{8}{60}= frac{2}{15} \ frac{8}{9}+ frac{7}{54}= frac{48}{54}+ frac{7}{54}= frac{55}{54}=1 frac{1}{54} \ frac{5}{6}- frac{17}{21}= frac{35}{42} - frac{34}{42}= frac{1}{42} \ frac{3}{16}+ frac{1}{24}= frac{18}{96}+ frac{4}{96}= frac{22}{96}= frac{11}{48} \ frac{5}{6}- frac{22}{27}= frac{45}{54} - frac{44}{54}= frac{1}{54}$
$frac{7}{25}- frac{4}{15}= frac{21}{75}- frac{20}{75} = frac{1}{75} \ frac{3}{10}+ frac{1}{6} = frac{9}{30}+ frac{5}{30} = frac{14}{30}= frac{7}{15} \ frac{2}{5}- frac{11}{30}= frac{12}{30}- frac{11}{30} = frac{1}{30} \ frac{3}{8}+ frac{7}{20}= frac{15}{40}+ frac{14}{40} = frac{29}{40} \ frac{1}{6}- frac{1}{7}= frac{7}{42}- frac{6}{42} = frac{1}{42}$