Explicación paso a paso:
1)
[tex]\frac{1}{5} +\frac{2}{3}\\\\\frac{3+10}{15} \\\\\frac{13}{15}[/tex]
2)
[tex]\frac{3}{4} +\frac{6}{9} \\\\\frac{3}{4}+\frac{2}{3} \\\\\frac{9+8}{12} \\\\\frac{17}{12}[/tex]
3)
[tex]\frac{10}{6} -\frac{2}{4} \\\\\frac{10}{6} -\frac{1}{2} \\\\\frac{10-3}{6} \\\\\frac{7}{6}[/tex]
4)
[tex]\frac{2}{8} -\frac{1}{6} \\\\\frac{1}{4} -\frac{1}{6} \\\\\frac{3-2}{12} \\\\\frac{1}{12}[/tex]
5)
[tex]\frac{3}{8} -\frac{1}{4} \\\\\frac{3-2}{8} \\\\\frac{1}{8}[/tex]
6)
[tex]\frac{2}{7} -\frac{1}{18} \\\\\frac{36-7}{126} \\\\\frac{26}{126}[/tex]
7)
[tex]\frac{7}{12} +\frac{6}{4} \\\\\frac{7}{12} +\frac{3}{2}\\\\\frac{7+18}{12} \\\\\frac{25}{12}[/tex]
8)
[tex]\frac{5}{16} -\frac{1}{4} \\\\\frac{5-4}{16} \\\\\frac{1}{16}[/tex]
Espero que te ayude.
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Explicación paso a paso:
1)
[tex]\frac{1}{5} +\frac{2}{3}\\\\\frac{3+10}{15} \\\\\frac{13}{15}[/tex]
2)
[tex]\frac{3}{4} +\frac{6}{9} \\\\\frac{3}{4}+\frac{2}{3} \\\\\frac{9+8}{12} \\\\\frac{17}{12}[/tex]
3)
[tex]\frac{10}{6} -\frac{2}{4} \\\\\frac{10}{6} -\frac{1}{2} \\\\\frac{10-3}{6} \\\\\frac{7}{6}[/tex]
4)
[tex]\frac{2}{8} -\frac{1}{6} \\\\\frac{1}{4} -\frac{1}{6} \\\\\frac{3-2}{12} \\\\\frac{1}{12}[/tex]
5)
[tex]\frac{3}{8} -\frac{1}{4} \\\\\frac{3-2}{8} \\\\\frac{1}{8}[/tex]
6)
[tex]\frac{2}{7} -\frac{1}{18} \\\\\frac{36-7}{126} \\\\\frac{26}{126}[/tex]
7)
[tex]\frac{7}{12} +\frac{6}{4} \\\\\frac{7}{12} +\frac{3}{2}\\\\\frac{7+18}{12} \\\\\frac{25}{12}[/tex]
8)
[tex]\frac{5}{16} -\frac{1}{4} \\\\\frac{5-4}{16} \\\\\frac{1}{16}[/tex]
Espero que te ayude.