Question

Calculati
4 asupra lui 2+ radical din 2 -5+2 radical din 2
rezolvarea

Answer 1

$\frac{4}{2+\sqrt{2}} -5+2\sqrt{2}\\ \frac{4*(2-\sqrt{2})}{4-2} -5+2\sqrt{2}\\ 2*(2-\sqrt{2})-5+2\sqrt{2}\\ 4-2\sqrt{2}-5+2\sqrt{2}=-1$