A cura di: Gianluca

$(sqrt(5)-1)(sqrt(6+2sqrt(5)))$

=$sqrt((sqrt(5)-1)(6+2sqrt(5)))$

=$sqrt((6-2sqrt(5))(6+2sqrt(5)))$

=$sqrt(36-4sqrt(25))$

=$sqrt(36-20)$

=$sqrt(16)$

=$4$ 

di Anoè Gianluca – www.chenesoio.com