Ответ:

Пошаговое объяснение:

[tex]5\frac{7}{8}+2\frac{5}{12} = 5\frac{21}{24}+2\frac{10}{24}=7\frac{31}{24} =8\frac{7}{24} \\ \\ 8\frac{3}{5}+\frac{1}{15} =8\frac{9}{15} +1\frac{1}{15} =9\frac{10}{15}=9\frac{2}{3} \\ \\ 9+3\frac{5}{8}=12\frac{5}{8} \\ \\ 2-\frac{5}{6}=1\frac{6}{6} -\frac{5}{6}=1\frac{1}{6} \\ \\ 7-3\frac{2}{5} =6\frac{5}{5} -3\frac{2}{5} =3\frac{3}{5} \\ \\ 1\frac{5}{12}-\frac{9}{10} =1\frac{25}{60}-\frac{54}{60} =\frac{85}{60} -\frac{54}{60} =\frac{31}{60}\\ \\[/tex]

[tex]4\frac{1}{6} +3\frac{2}{5} =4\frac{5}{30}+3\frac{12}{30} =7\frac{17}{30} \\ \\ 2\frac{13}{14} -1\frac{20}{21} =2\frac{39}{42} -1\frac{40}{42}=1\frac{81}{42} -1\frac{40}{42} =\frac{41}{42}\\ \\ 6\frac{5}{6} -\frac{2}{9} =6\frac{15}{18}-\frac{4}{18} =6\frac{11}{18}\\ \\ 7\frac{4}{7}-5\frac{7}{9}=7\frac{36}{63} -5\frac{49}{63} =6\frac{99}{63} -5\frac{49}{63}=1\frac{50}{63} \\ \\[/tex]

[tex]2,4-1\frac{2}{3} =2\frac{4}{10}-1\frac{2}{3} =2\frac{12}{30} -1\frac{20}{30}=1\frac{42}{30}-1\frac{20}{30} =\frac{22}{30}=\frac{11}{15} \\ \\ 6\frac{7}{15} -3\frac{1}{5}= 6\frac{7}{15} -3\frac{3}{15}= 3\frac{4}{15}[/tex]