Question

Rezultatul calculului:

$\frac{3+ \sqrt{5} }{2 \sqrt{5} } + \frac{7-3 \sqrt{5} }{ \sqrt{5} } - \frac{25-7 \sqrt{5} }{ \sqrt{45} }$

Answer 1

=(3√5+5)/2*5+(7√5-3*5)/5-(25-7√5)/3√5=
(3√5+5)/10+(7√5-15)/5-(25√5-35)/15=
(9√5+15+42√5-90-50√5+70)/30=
(√5-5)/30