Question

Dau coroana !!!!!!!

Answer 1

Explicație pas cu pas:

$A = \Big\{- \dfrac{2}{3}; 0.(5); \dfrac{4}{2}; \sqrt{49}; \sqrt{50}; \dfrac{ \sqrt{7} }{2}\Big\}$

$\dfrac{4}{2} = 2 \ ; \ \sqrt{49} = 7$

$A \cap \mathbb{N} = \Big\{\dfrac{4}{2}; \sqrt{49}\Big\}$

$A \cap \mathbb{Z} = \Big\{\dfrac{4}{2}; \sqrt{49}\Big\}$

$A \cap \mathbb{Q} = \Big\{- \dfrac{2}{3}; 0.(5); \dfrac{4}{2}; \sqrt{49}\Big\}$

$A \cap (\mathbb{R - Q}) = \Big\{\sqrt{50}; \dfrac{ \sqrt{7} }{2}\Big\}$