Răspuns:
[tex]\displaystyle a) \ \sqrt{\frac{4}{9} } \ = \ \sqrt{\frac{2^{2} }{3^{2} } } \ = \frac{2}{3} \\\\ \displaystyle b) \ \sqrt{\frac{25}{49} } \ = \ \sqrt{\frac{5^{2} }{7^{2} } } \ = \frac{5}{7} \\\displaystyle c) \ \sqrt{\frac{81}{100} } \ = \ \sqrt{\frac{9^{2} }{10^{2} } } \ = \frac{9}{10} \\\\\displaystyle d) \sqrt{\frac{225}{121} } \ = \ \sqrt{\frac{15^{2} }{11^{2} } } \ = \frac{15}{11} \\\\\displaystyle f) \sqrt{\frac{81}{324} } \ = \ \sqrt{\frac{9^{2} }{18^{2} } } \ = \frac{9}{18} = \frac{1}{2}[/tex]
