Řeš v ℝ nerovnice:
\large x \le \sqrt 2
\large K = \left( - \infty ;\sqrt 2 \right \rangle
\large K = \left( - \infty ;\sqrt 3 \right \rangle
\large K = \left( - \infty ;2 \right \rangle
\large K = \left( - \infty ;\sqrt 2 \right )