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23.5: División de expresiones de raíz cuadrada
https://espanol.libretexts.org/Matematicas/Aritmetica_y_Matematicas_Basicas/HiSet_Mathematicas_Saul_Lopez/23%3A_Raices_Radicales_y_Ecuaciones_de_Raiz_Cuadrada/23.05%3A_Division_de_expresiones_de_raiz_cuadrada
\(\dfrac{\sqrt{21}}{\sqrt{7}}=\dfrac{\sqrt{21}}{7} \cdot \dfrac{\sqrt{7}}{\sqrt{7}}=\dfrac{\sqrt{21 \cdot 7}}{7}=\dfrac{\sqrt{3 \cdot 7 \cdot 7}}{7}=\dfrac{\sqrt{3 \cdot 7^{2}}}{7}=\dfrac{7 \sqrt{3}}{... $\dfrac{\sqrt{21}}{\sqrt{7}}=\dfrac{\sqrt{21}}{7} \cdot \dfrac{\sqrt{7}}{\sqrt{7}}=\dfrac{\sqrt{21 \cdot 7}}{7}=\dfrac{\sqrt{3 \cdot 7 \cdot 7}}{7}=\dfrac{\sqrt{3 \cdot 7^{2}}}{7}=\dfrac{7 \sqrt{3}}{7}=\sqrt{3}$ \ dfrac {\ sqrt {2 x}} {\ sqrt {3} -\ sqrt {5 x}}\ cdot\ dfrac {\ sqrt {3} +\ sqrt {5 x}} {\ sqrt {3} +\ sqrt {5 x}} &=\ dfrac {\ sqrt {2 x} (\ sqrt {3} +\ sqrt {5 x})} {(\ sqrt {3}) ^ {2} - (\ sqrt {5 x}) ^ {2}}\\

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