Правый столбец: вычислите 1/18 + 2/10; 1/6 − 1/10; 5/33 + 5/18; 4/21 − 2/27; 1/9 + 4/15; 7/40 − 2/24; 1/50 + 4/25; 6/35 − 1/21; 1/64 + 1/16; 5/28 − 1/14; 4/34 + 1/20; 8/44 − 1/36; 5/36 + 1/45; 10/39 − 3/24.

Приводим дроби к общему знаменателю и сокращаем, где это возможно.

1. \(\frac{1}{18}+\frac{2}{10}=\frac{5}{90}+\frac{18}{90}=\frac{23}{90}\).
2. \(\frac{1}{6}-\frac{1}{10}=\frac{5}{30}-\frac{3}{30}=\frac{1}{15}\).
3. \(\frac{5}{33}+\frac{5}{18}=\frac{30}{198}+\frac{55}{198}=\frac{85}{198}\).
4. \(\frac{4}{21}-\frac{2}{27}=\frac{36}{189}-\frac{14}{189}=\frac{22}{189}\).
5. \(\frac{1}{9}+\frac{4}{15}=\frac{5}{45}+\frac{12}{45}=\frac{17}{45}\).
6. \(\frac{7}{40}-\frac{2}{24}=\frac{21}{120}-\frac{10}{120}=\frac{11}{120}\).
7. \(\frac{1}{50}+\frac{4}{25}=\frac{1}{50}+\frac{8}{50}=\frac{9}{50}\).
8. \(\frac{6}{35}-\frac{1}{21}=\frac{18}{105}-\frac{5}{105}=\frac{13}{105}\).
9. \(\frac{1}{64}+\frac{1}{16}=\frac{1}{64}+\frac{4}{64}=\frac{5}{64}\).
10. \(\frac{5}{28}-\frac{1}{14}=\frac{5}{28}-\frac{2}{28}=\frac{3}{28}\).
11. \(\frac{4}{34}+\frac{1}{20}=\frac{2}{17}+\frac{1}{20}=\frac{40}{340}+\frac{17}{340}=\frac{57}{340}\).
12. \(\frac{8}{44}-\frac{1}{36}=\frac{2}{11}-\frac{1}{36}=\frac{72}{396}-\frac{11}{396}=\frac{61}{396}\).
13. \(\frac{5}{36}+\frac{1}{45}=\frac{25}{180}+\frac{4}{180}=\frac{29}{180}\).
14. \(\frac{10}{39}-\frac{3}{24}=\frac{10}{39}-\frac{1}{8}=\frac{80}{312}-\frac{39}{312}=\frac{41}{312}\).