Řeš v dané množině nerovnici:
\( \large 9{x^{2}}-6 x + 1 \le 0 \) v \( \Z \)
\( \large K = \{0\} \)
\( \large K = \emptyset \)
\( \large K = \{1\} \)
\( \large K = \{-1, 1\} \)
