Question

$( sqrt{8 frac{2}{5} } - sqrt{2 frac{1}{10} } ) : sqrt{ frac{105}{8} }$

Answer 1

$...=(sqrt{frac{42}{5}}-sqrt{frac{21}{10}})cdot sqrt{frac{8}{105}}=sqrt{frac{42cdot 8}{5cdot 105}}-sqrt{frac{21cdot 8}{10cdot 105}}=sqrt{frac{16}{25}}-sqrt{frac{4}{25}}=\\=frac{4}{5}-frac{2}{5}=frac{2}{5}$

Answer 2

Благодарю!