[tex]3- \frac{5}{5} = \frac{3}{1} - \frac{5}{5} \\\\
~~~~~~~~= \frac{3*5}{1*5} - \frac{5}{5} \\\\
~~~~~~~~= \frac{15}{5} - \frac{5}{5} \\\\
~~~~~~~~= \frac{10}{5} \\\\
~~~~~~~~=2\\\\\\
sau...\\
\frac{3-5}{5} = \frac{-2}{5} (in~caz~ca~totul~este~supra~5)
[/tex]
