duyanh052

 

$DK$ :

$\left\{\begin{matrix} 25-x^{2}\geq 0 & & \\ 3-\sqrt{25-x^{2}}\neq 0 & & \end{matrix}\right. \Leftrightarrow \left\{\begin{matrix} -5\leq x\leq 5 & & \\ x\neq \pm 4 & & 

 

 

$DK$ :

$\left\{\begin{matrix} 25-x^{2}\geq 0 & & \\ 3-\sqrt{25-x^{2}}\neq 0 & & \end{matrix}\right. \Leftrightarrow \left\{\begin{matrix} -5\leq x\leq 5 & & \\ x\neq \pm 4 & & \end{matrix}\right.$

Vậy $S=[-5;5]\setminus \begin{Bmatrix} -4;4 \end{Bmatrix}$

cảm ơn nhiều

 

\end{matrix}\right.$

Vậy $S=[-5;5]\setminus \begin{Bmatrix} -4;4 \end{Bmatrix}$