Question

$frac{sqrt{7}-sqrt{2}}{sqrt{7}+sqrt{2}}+frac{sqrt{7}+sqrt{2}}{sqrt{7}-sqrt{2}}$

Answer 1

V - корень
(V7 - V2)/(V7 + V2) + (V7 + V2)/(V7 - V2) = (7 - 2V14 + 2 + 7 + 2V14 + 2)/(7 - 2) = 18/5