Răspuns:
[tex] \frac{ \sqrt{5} }{ \sqrt{2} } \times \frac{ \sqrt{2} }{ \sqrt{2} } = \frac{ \sqrt{5} \times \sqrt{2} }{ \sqrt{2} \times \sqrt{2} } = \frac{ \sqrt{10} }{ \sqrt{4} } = \frac{ \sqrt{10} }{2} [/tex]
[tex] \frac{ \sqrt{7} }{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } = \frac{ \sqrt{7} \times \sqrt{3} }{ \sqrt{3} \times \sqrt{3} } = \frac{ \sqrt{21} }{ \sqrt{9} } = \frac{ \sqrt{21} }{3} [/tex]
[tex] \sqrt{5 \frac{2}{3} } = \sqrt{ \frac{17}{3} } = \frac{ \sqrt{17} }{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } = \frac{ \sqrt{17} \times \sqrt{3} }{ \sqrt{3} \times \sqrt{3} } = \frac{ \sqrt{51} }{ \sqrt{9} } = \frac{ \sqrt{51} }{3} [/tex]
