Răspuns:
[tex] \frac{ \sqrt{400 - 64 \times 4} }{x} = \frac{2 \sqrt{81 + 63} }{ \frac{9}{4} \times \sqrt{ \frac{16}{9} } } \\ \frac{ \sqrt{256} }{x} = \frac{2 \sqrt{144} }{ \frac{9}{4} \times \frac{4}{3} } \\ \frac{16}{x} = \frac{2 \times 12}{3} \\ \frac{16}{x} = \frac{24}{3} \\ 24x = 16 \times 3 \\ 24x = 48 \\ x = 48 \div 24 = 2 \\ x = 2[/tex]
