ex 6 va rog va dau coroana
![Ex 6 Va Rog Va Dau Coroana class=](https://ro-static.z-dn.net/files/d11/ae41241c1a68314d24c023b2f1f394a2.jpg)
(2rad5*2+5rad5*n)/(n+2)=4rad5
(5n+2)*rad5=4rad5(n+2)
5n+2=4(n+2)
5n+2=4n+8
5n-4n=8-2
n=6