\[\boxed{\text{402}\text{\ (402)}\text{.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ x^{2} - 4x + 4 < 0\]
\[Ответ:\ \varnothing.\]
\[2)\ x^{2} - 4x + 4 \leq 0\]
\[Ответ:\left\{ 2 \right\}\text{.\ }\]
\[3)\ x^{2} - 4x + 4 > 0\]
\[Ответ:( - \infty;2) \cup (2;\ + \infty).\]
\[4)\ x^{2} - 4x + 4 \geq 0\]
\[Ответ:( - \infty; + \infty).\]