Sagot :
[tex]\frac{1}{2}-\frac{1}{7}=\ \ \ | make\ common \denominator\\\\
\frac{7}{14}-\frac{2}{14}=\frac{7-2}{14}=\frac{5}{14}\\\\
\frac{3}{5}-\frac{1}{2}= \ \ \ | make\ common \denominator\\\\ \frac{6}{10}-\frac{5}{10}=\frac{1}{10}[/tex]