\(=\dfrac{\left(5+\sqrt{5}\right)\left(\sqrt{5}-2\right)}{\left(\sqrt{5}+2\right)\left(\sqrt{5}-2\right)}+\dfrac{\sqrt{5}\left(\sqrt{5}+1\right)}{\left(\sqrt{5}+1\right)\left(\sqrt{5}-1\right)}-\dfrac{3\sqrt{5}\left(3-\sqrt{5}\right)}{\left(3+\sqrt{5}\right)\left(3-\sqrt{5}\right)}\)
\(=\dfrac{3\sqrt{5}-5}{1}+\dfrac{5+\sqrt{5}}{4}-\dfrac{9\sqrt{5}-15}{4}\)
\(=\sqrt{5}\)
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ko dùng máy tính bỏ túi
