0 \\
3x(3-x)>0 \\
\left \{ {{3x>0 \atop {3-x>0}} \right. \ \ \ \ \ \left \{ {{3x<0} \atop {3-x<0}} \right. \\
\left \{ {{x>0 \atop {x<3}} \right. \ \ \ \ \ \left \{ {{x<0} \atop {x>3}} \right. \\
(0;3)" alt="9x-3x^2>0 \\
3x(3-x)>0 \\
\left \{ {{3x>0 \atop {3-x>0}} \right. \ \ \ \ \ \left \{ {{3x<0} \atop {3-x<0}} \right. \\
\left \{ {{x>0 \atop {x<3}} \right. \ \ \ \ \ \left \{ {{x<0} \atop {x>3}} \right. \\
(0;3)" align="absmiddle" class="latex-formula">