Question

Rexolvate pas cu pas

Answer 1

Explicație pas cu pas:

$\frac{ \sqrt{20} }{ \sqrt{7} - \sqrt{5} } - \sqrt{35} = \frac{ \sqrt{20}( \sqrt{7} + \sqrt{5})}{(\sqrt{7} - \sqrt{5})(\sqrt{7} + \sqrt{5})} - \sqrt{35} \\ = \frac{ \sqrt{140} + \sqrt{100}}{7 - 2} - \sqrt{35} = \frac{2 \sqrt{35} + 10 }{2} - \sqrt{35} \\ = \frac{2( \sqrt{35} + 5)}{2} - \sqrt{35} = \sqrt{35} + 5 - \sqrt{35} = 5$

Answer 2

rad20 = 2rad5
2rad5(rad7 + rad5)/(7-5) - rad35 =
rad35 + 5 - rad35 =
5