[tex](\frac{2(\sqrt{7}-\sqrt{5})}{2}+\frac{3(\sqrt{5}+\sqrt{2}}{3})^2\cdot\frac{8}{2(\sqrt{7}+\sqrt{2})^2}=(\sqrt{7}+\sqrt{2})^2\cdot \frac{8}{2(\sqrt{7}+\sqrt{2})^2}=4\in N[/tex]
[tex](\sqrt{7}+\sqrt{2})^2\cdot\frac{4}{(\sqrt{7}+\sqrt{2})^2}=4\in N[/tex]
ATENTIE! Ai scris gresit ex. Vezi ca la a doua fr esra radical din 2 ,nu din3!
