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September 2021 1 91 Report

Срочно!Нужно избавиться от иррационала.Помогите, пожалуйста.
[tex] \frac{1}{ \sqrt{2} + \sqrt{5} - \sqrt{3} } [/tex]

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Artem112

Verified answer

$\dfrac{1}{\sqrt{2}+\sqrt{5}-\sqrt{3}}=\dfrac{(\sqrt{2}+\sqrt{5})+\sqrt{3}}{((\sqrt{2}+\sqrt{5})-\sqrt{3})((\sqrt{2}+\sqrt{5})+\sqrt{3})}=\\\\=\dfrac{\sqrt{2}+\sqrt{5}+\sqrt{3}}{(\sqrt{2}+\sqrt{5})^2-(\sqrt{3})^2}=\dfrac{\sqrt{2}+\sqrt{5}+\sqrt{3}}{2+2\sqrt{10}+5-3}=\dfrac{\sqrt{2}+\sqrt{5}+\sqrt{3}}{4+2\sqrt{10}}=\\\\=\dfrac{\sqrt{2}+\sqrt{5}+\sqrt{3}}{2(2+\sqrt{10})}=\dfrac{(\sqrt{2}+\sqrt{5}+\sqrt{3})(2-\sqrt{10})}{2(2+\sqrt{10})(2-\sqrt{10})}=$

$=\dfrac{2\sqrt{2}-\sqrt{20}+2\sqrt{5}-\sqrt{50}+2\sqrt{3}-\sqrt{30}}{2(2^2-(\sqrt{10})^2)}=\\\\=\dfrac{2\sqrt{2}-2\sqrt{5}+2\sqrt{5}-5\sqrt{2}+2\sqrt{3}-\sqrt{30}}{2(4-10)}=\\\\=\dfrac{-3\sqrt{2}+2\sqrt{3}-\sqrt{30}}{-12}=\dfrac{3\sqrt{2}-2\sqrt{3}+\sqrt{30}}{12}$

1 votes Thanks 4

damettie Ответ: (2+√5+√3)*(√10-2)/12.

damettie Но всё равно спасибо.

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