\newproblem{ \begin{problem}[3] \FPsetpar{a}{2}{5} \FPsetpar{b}{3}{5} \FPsetpar{c}{\a}{8} $a=\a$, $b=\b$, $c=\c$ \pair{$\a+\b$}{$\FPsv{a+b}$} \pair{$\c-\a$}{$\FPsv{c-a}$} \pair{$\a \times \b$}{$\FPsv{a*b}$} \matching \end{problem} } \newproblem{ \begin{problem}[3] \FPsetpar{a}{12}{15} \FPsetpar{b}{13}{15} \FPsetpar{c}{2}{4} \FPsetpar{k}{3}{5} $a=\a$, $b=\b$, $c=\c$ \pair{$\FPsv{k*a}:\a$}{$\k$} \pair{$\k^{\c}$}{$\FPsv{k^c}$} \pair{$\a \times \b$}{$\FPsv{a*b}$} \matching \end{problem} }