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Автор - egorik0321

Помогите сделать 28 номер СРОЧНО!!!

Ответ

Автор - bestiacat
3 sqrt{ frac{1}{5}}+ frac{1}{2} sqrt{20}+ sqrt{ frac{4}{5} }= 3 sqrt{ frac{1}{5}}+ frac{1}{2} sqrt{2*2*5}+ sqrt{ 2*2* frac{1}{5} }=3sqrt{frac{1}{5}}+frac{1}{2}*2sqrt{5}+2sqrt{frac{1}{5}}=5sqrt{frac{1}{5}}+sqrt{5}=sqrt{frac{5*5}{5}}+sqrt{5}=sqrt{5}+sqrt{5}=2sqrt{5}

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