[tex]A \cap \mathbb{Q}=\lbrace -1;1,(4);\dfrac{1}{3}; \sqrt{0,01} \rbrace\\
A \cap \mathbb{R-Q}=\lbrace \sqrt2,\sqrt{12}, \pi \rbrace \\
card (A \cap \mathbb{Q})=4 \; ; \; card (A \cap \mathbb{R-Q})=3\\ 4>3 \Rightarrow card (A\cap \mathbb{Q}) > card (A \cap \mathbb{R-Q})[/tex]
Mulțimea [tex] A \cap \mathbb{Q} [/tex] are mai multe elemente.