[tex]5\sqrt{130} =a\sqrt{5} \\\\a\sqrt{5} =5\sqrt{130} ~~\mid \div \sqrt{5} \\\\a=\dfrac{5\sqrt{130} }{\sqrt{5} } \\\\\\a=5\dfrac{\sqrt{130} }{\sqrt{5} } \\\\\\a=5\sqrt{\dfrac{130}{5} } \\\\\\a=5\sqrt{26} \\\\\\Odp:~~B.~~a=5\sqrt{26}[/tex]
korzystam ze wzoru:
[tex]\dfrac{\sqrt[n]{x} }{\sqrt[n]{y} } =\sqrt[n]{\dfrac{x}{y} } ~~[/tex]
