Question

Номер 9, помогите плиз

Answer 1

$sqrt{27 - 8 sqrt{11} } = sqrt{16 + 11 - 8 sqrt{11} } = sqrt{{(4 - sqrt{11 }) }^{2} } = 4 - sqrt{11} \ frac{5}{4 + sqrt{11} } = frac{5 times (4 - sqrt{11} )}{16 - 11} = 4 - sqrt{11} \ sqrt{27 - 8 sqrt{11} } = frac{5}{4 + sqrt{11} } \ f(27 - 8 sqrt{11} ) = g(4 + sqrt{11} )$