\[f( - 2,5) = 0;\ \ \]
\[f( - 2) = 1,5;\ \ \]
\[\text{\ f}( - 0,5) = 2,5;\ \ \]
\[f(0) = 2;\ \]
\[f(0,5) = 1,5;\ \]
\[\text{\ f}(3) = - 1,5.\]