Question

Помогите с 3 заданием

Answer 1

$\frac{2 - \sqrt{2} }{2 + \sqrt{2} } = \frac{(2 - \sqrt{2}) \times (2 - \sqrt{2} )}{2} = \frac{(2 - \sqrt{2} ) {}^{2} }{2} = \frac{4 - 4 \sqrt{2} + 2}{2} = \frac{6 - 4 \sqrt{2} }{2} = \frac{2(3 - 2 \sqrt{2}) }{2} = 3 - 2 \sqrt{2}$