Question

REPEDE VA ROG DAU COROANA!!

Answer 1

$(\frac{2}{\sqrt{5}}-\frac{11\sqrt{5}}{5})*(\frac{\sqrt{5}}{5}-\frac{4}{\sqrt{5}})^{-1}=\\ \\ (\frac{2\sqrt{5}-11\sqrt{5}}{5})*(\frac{\sqrt{5}-4\sqrt{5}}{5})^{-1}=\\ \\ \frac{-9\sqrt{5}}{5} *(\frac{-3\sqrt{5}}{5})^{-1}=\\ \\ \frac{-9\sqrt{5}}{5}*\frac{1}{\frac{-3\sqrt{5}}{5}}=3.$

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