Răspuns:
[tex]a) - \sqrt{3} \times ( - \sqrt{1 \ \frac{1}{3} } ) = \\ = - \sqrt{3} \times ( - \sqrt{ \frac{4}{3} } ) \\ = \sqrt{3} \times \frac{2}{ \sqrt{3} } = 2[/tex]
[tex]b) \sqrt{ \frac{7}{15} } \times \sqrt{4 \frac{1}{5} } = \sqrt{ \frac{7}{15} } \times \sqrt{ \frac{21}{5} } = \sqrt{ \frac{7}{15} \times \frac{21}{5} } = \sqrt{ \frac{7}{5} \times \frac{7}{5} } = \frac{ \sqrt{49} }{ \sqrt 25} = \frac{7}{5} [/tex]
