Ответ: [tex]\frac{1}{4}+\frac{1}{3}=\frac{3}{12}+\frac{4}{12}=\frac{7}{12}[/tex][tex]\frac{1}{5}+\frac{1}{2}=\frac{2}{10}+\frac{5}{10}=\frac{7}{10}=0,7[/tex][tex]\frac{1}{3}+\frac{1}{7}=\frac{7}{21}+\frac{3}{21}=\frac{10}{21}[/tex][tex]\frac{1}{6}+\frac{1}{5}=\frac{5}{30}+\frac{6}{30}=\frac{11}{30}[/tex]