Question

помогите решить пожалуйста!!!!!

Answer 1

$frac{4b-2}{2sqrt{b}-sqrt{2}}=frac{(2sqrt{b})^2-(sqrt{2})^2}{2sqrt{b}-sqrt{2}}=frac{(2sqrt{b}-sqrt{2})(2sqrt{b}+sqrt{2})}{2sqrt{b}-sqrt{2}}=2sqrt{b}+sqrt{2}$