
$$
   \log_3(x^2-3x+3)\le0
$$
$$
\left\{
   \begin{array}{rcl}
      x^2-3x+3 & \le & 1\\
      x^2-3x+3 &  >  & 0
   \end{array}
\right.
$$
$$
\left\{
   \begin{array}{rcl}
      x^2-3x+2 & \le & 0\\
      x^2-3x+3 &  >  & 0
   \end{array}
\right.
$$
Doln� nerovnost plat� pro v�echna $x$ ($D<0$)
\begin{eqnarray*}
   x^2-3x+2    &\le&0\\
   (x-1)(x-2)  &\le&0\\
\\
   x           &\in&\langle1,2\rangle
\end{eqnarray*}
