Question

СРОЧНО!!!!! ДАЮ 30 БАЛЛОВ!!!! ​

Answer 1

$\displaystyle \frac{\sqrt{2} -1}{\sqrt{2}+1 } = \frac{(\sqrt{2} -1)*(\sqrt{2} -1)} {(\sqrt{2}+1)(\sqrt{2} -1)} =\frac{2-2*\sqrt{2} +1}{(\sqrt{2})^{2} -1^{2} } =\frac{3-2\sqrt{2} }{1} =3-2\sqrt{2}$