Выполни действия A 3/4-2/5= 1/3+5/12= 5/8-3/16= 1/10+7/10= 9/17+8/17= 2/5-1/3= 1/6+5/12= 5/9-4/27= 1/8+3/8= 7/10-1/2= 7/12+1/2= 2/7+5/14= 11/15-2/5= 5/6-1/6= 1/6+3/5

Давайте пошагово выполним все указанные действия:

1. $\frac{3}{4} - \frac{2}{5} = \frac{15}{20} - \frac{8}{20} = \frac{7}{20}$

2. $\frac{1}{3} + \frac{5}{12} = \frac{4}{12} + \frac{5}{12} = \frac{9}{12} = \frac{3}{4}$

3. $\frac{5}{8} - \frac{3}{16} = \frac{10}{16} - \frac{3}{16} = \frac{7}{16}$

4. $\frac{1}{10} + \frac{7}{10} = \frac{8}{10} = \frac{4}{5}$

5. $\frac{9}{17} + \frac{8}{17} = \frac{17}{17} = 1$

6. $\frac{2}{5} - \frac{1}{3} = \frac{6}{15} - \frac{5}{15} = \frac{1}{15}$

7. $\frac{1}{6} + \frac{5}{12} = \frac{2}{12} + \frac{5}{12} = \frac{7}{12}$

8. $\frac{5}{9} - \frac{4}{27} = \frac{15}{27} - \frac{4}{27} = \frac{11}{27}$

9. $\frac{1}{8} + \frac{3}{8} = \frac{4}{8} = \frac{1}{2}$

10. $\frac{7}{10} - \frac{1}{2} = \frac{7}{10} - \frac{5}{10} = \frac{2}{10} = \frac{1}{5}$

11. $\frac{7}{12} + \frac{1}{2} = \frac{7}{12} + \frac{6}{12} = \frac{13}{12} = 1 \frac{1}{12}$