Răspuns:
[tex] \sqrt{2} \times \sqrt{3} = \sqrt{6 } [/tex]
[tex] \sqrt{3} \times \sqrt{5} = \sqrt{15} [/tex]
[tex] \sqrt{5} \times ( - \sqrt{7} ) = - \sqrt {35 } [/tex]
[tex] - \sqrt{5} \times \sqrt{11} = - \sqrt{55} [/tex]
[tex]( - \sqrt{13} ) \times ( - \sqrt{2}) = \sqrt{26} [/tex]
[tex] - \sqrt{2} \times ( - \sqrt{3} ) \times ( - \sqrt{5} ) = - \sqrt{30} [/tex]
