$D=\mathbb{Q}\setminus \{-4\}D=\; \backslash mathbb\{Q\}\backslash setminus\; \backslash \{-4\backslash \}$

$D=\mathbb{Q}\setminus \{0\}D=\backslash mathbb\{Q\}\backslash setminus\; \backslash \{0\backslash \}$

$D=\mathbb{Q}\setminus \{\mathrm{2,5}\}D=\; \backslash mathbb\{Q\}\backslash setminus\; \backslash \{2\{,\}5\backslash \}$

$D=\mathbb{Q}\setminus \{5\}D=\; \backslash mathbb\{Q\}\backslash setminus\; \backslash \{5\backslash \}$