Matematika A - 2010. ljeto, 1.

$-1.5\in \mathbf{Z}-1.5\; \backslash in\; \backslash mathbf\{Z\}$

$\sqrt{2}\in \mathbf{Q}\backslash sqrt\{2\}\; \backslash in\; \backslash mathbf\{Q\}$

$\frac{1}{2}\in \mathbf{R}\backslash frac\{1\}\{2\}\; \backslash in\; \backslash mathbf\{R\}$

$\pi \in \mathbf{N}\backslash pi\; \backslash in\; \backslash mathbf\{N\}$