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Автор - TopGamerInTheWorld

(корень45-корень5)^2/20

Ответ

Проверено экспертом

Автор - Rechnung
 frac{( sqrt{45} - sqrt{5})^2 }{20}= frac{( sqrt{45})^2+( sqrt{5})^2-2 sqrt{45*5}   }{20}= frac{45+5-2 sqrt{5*9*5} }{20}= frac{50-2*5*3}{20}=\\= frac{50-30}{20}= frac{20}{20}=1

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