26. Найди значение суммы или разности. А: 1/3+1/6; 1/2+1/3; 3/5−1/10; 1/12+5/6; 1/3+1/4; 1/3+2/5; 1/2−1/4; 8/7−1; 1/4−1/5; 1/2+3/7; 3/4−1/8; 1/6+1/6; 4/15+2/5; 7/10−1/2; 1/3−1/4. Б: 1/3−1/6; 3/20+3/4; 7/9−2/3; 1/4+1/5; 2/5+4/15; 1/3+1/4; 2/3−2/5; 1/5−1/6; 1/2+1/4; 7/6−1; 1/2+2/7; 1/2−1/3; 3/4+1/8; 5/6−7/12; 2/5+3/10. В: 11/20−5/12; 8/9+7/54; 5/6−17/21; 3/16+1/24; 5/6−22/27; 7/25−4/15; 3/10+1/6; 2/5−11/30; 3/8+7/20; 1/6−1/7; 5/9+7/15; 3/8+19/56; 19/45−7/18; 1/4−1/8; 11/14+8/21.

Приводим дроби к общему знаменателю, затем выполняем сложение или вычитание и сокращаем результат.

А:

1. \(\frac{1}{3}+\frac{1}{6}=\frac{2}{6}+\frac{1}{6}=\frac{1}{2}\)
2. \(\frac{1}{2}+\frac{1}{3}=\frac{3}{6}+\frac{2}{6}=\frac{5}{6}\)
3. \(\frac{3}{5}-\frac{1}{10}=\frac{6}{10}-\frac{1}{10}=\frac{1}{2}\)
4. \(\frac{1}{12}+\frac{5}{6}=\frac{1}{12}+\frac{10}{12}=\frac{11}{12}\)
5. \(\frac{1}{3}+\frac{1}{4}=\frac{4}{12}+\frac{3}{12}=\frac{7}{12}\)
6. \(\frac{1}{3}+\frac{2}{5}=\frac{5}{15}+\frac{6}{15}=\frac{11}{15}\)
7. \(\frac{1}{2}-\frac{1}{4}=\frac{1}{4}\)
8. \(\frac{8}{7}-1=\frac{8}{7}-\frac{7}{7}=\frac{1}{7}\)
9. \(\frac{1}{4}-\frac{1}{5}=\frac{5}{20}-\frac{4}{20}=\frac{1}{20}\)
10. \(\frac{1}{2}+\frac{3}{7}=\frac{7}{14}+\frac{6}{14}=\frac{13}{14}\)
11. \(\frac{3}{4}-\frac{1}{8}=\frac{6}{8}-\frac{1}{8}=\frac{5}{8}\)
12. \(\frac{1}{6}+\frac{1}{6}=\frac{1}{3}\)
13. \(\frac{4}{15}+\frac{2}{5}=\frac{4}{15}+\frac{6}{15}=\frac{2}{3}\)
14. \(\frac{7}{10}-\frac{1}{2}=\frac{7}{10}-\frac{5}{10}=\frac{1}{5}\)
15. \(\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)

Б: \(\frac{1}{6};\ \frac{9}{10};\ \frac{1}{9};\ \frac{9}{20};\ \frac{2}{3};\ \frac{7}{12};\ \frac{4}{15};\ \frac{1}{30};\ \frac{3}{4};\ \frac{1}{6};\ \frac{11}{14};\ \frac{1}{6};\ \frac{7}{8};\ \frac{1}{4};\ \frac{7}{10}\).

В: \(\frac{2}{15};\ \frac{55}{54};\ \frac{1}{42};\ \frac{11}{48};\ \frac{1}{54};\ \frac{1}{75};\ \frac{7}{15};\ \frac{1}{30};\ \frac{29}{40};\ \frac{1}{42};\ \frac{46}{45};\ \frac{5}{7};\ \frac{1}{30};\ \frac{1}{8};\ \frac{7}{6}\).