HOC24
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\(\left(x^2-1\right)\)+(x+1)(x-2)=0
\(\left(1-\dfrac{5+\sqrt{5}}{1+\sqrt{5}}\right)\left(\dfrac{5-\sqrt{5}}{1-\sqrt{5}}-1\right)\)
\(\dfrac{\sqrt{10}-\sqrt{2}}{\sqrt{5}-1}\) + \(\dfrac{2-\sqrt{2}}{\sqrt{2}-1}\)
\(\sqrt{\left(\sqrt{8}-4\right)^2}\)
\(\left(3\sqrt{20}-\sqrt{125}-15\sqrt{\dfrac{1}{5}}\right)\) . \(\sqrt{5}\)
\(\left(\sqrt{125}-\sqrt{12}-2\sqrt{5}\right)\left(3\sqrt{5}-\sqrt{3}+\sqrt{27}\right)\)
\(\dfrac{1}{\sqrt{5}-\sqrt{3}}\) - \(\dfrac{1}{\sqrt{5}+\sqrt{3}}\)