Question

Помогите с 3 заданием

Answer 1

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