Question

cine mă poate ajuta?​

Answer 1

Răspuns:

$\frac{ \sqrt{20} }{ \sqrt{7} - \sqrt{5} } - \sqrt{35} = \\ \frac{2 \sqrt{5} ( \sqrt{7 } + \sqrt{5} )}{7 - 5} - \sqrt{35} \\ \frac{2 \sqrt{35} + 10}{2} - \sqrt{35} \\ \frac{2 \sqrt{35} + 10 - 2 \sqrt{35} }{2 } = 10 \div 2 = 5$