[tex]a)\\\frac{1}{3}+\frac{5}{2}\\\\=\frac{2}{6}+\frac{15}{6}\\\\=\frac{2+15}{6}\\\\\mathrm{Somar:}\:2+15=17\\\\=\frac{17}{6}[/tex]
[tex]b)\\\frac{4}{7}-\frac{8}{10}\\\\=\frac{4}{7}-\frac{4}{5}\\\\=\frac{20}{35}-\frac{28}{35}\\\\\mathrm{Somar:}\:20-28=-8\\\\=\frac{-8}{35}\\\\\mathrm{Aplicar\:as\:propriedades\:das\:fracoes}:\\\\=-\frac{8}{35}[/tex]
[tex]c)\\\frac{2}{5}+\frac{3}{6}\\\\=\frac{2}{5}+\frac{1}{2}\\\\=\frac{4}{10}+\frac{5}{10}\\\\=\frac{4+5}{10}\\\\\mathrm{Somar:}\:4+5=9\\\\=\frac{9}{10}[/tex]
[tex]d)\\\frac{6}{7}-\frac{9}{7}\\\\\frac{6-9}{7}\\\\\mathrm{Somar:}\:6-9=-3\\\\=\frac{-3}{7}\\\\=-\frac{3}{7}[/tex]
[tex]e)\\\frac{3}{10}+\frac{4}{2}\\\\=\frac{3}{10}+\frac{20}{10}\\\\\mathrm{Somar:}\:3+20=23\\\\=\frac{23}{10}[/tex]
[tex]f)\\\frac{4}{9}-\frac{8}{6}\\\\=\frac{4}{9}-\frac{12}{9}\\\\=\frac{4-12}{9}\\\\\mathrm{Somar:}\:4-12=-8\\\\=\frac{-8}{9}\\\\=-\frac{8}{9}[/tex]
