Question

решите пж!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$displaystyle frac{ab}{a^2-b^2}:frac{a^2b^2}{a-b}=frac{ab}{(a-b)(a+b)}cdotfrac{a-b}{(ab)^2}=frac{1}{(a+b)ab}\\\a=5+sqrt5,quad b=5-sqrt5\\frac{1}{(5+sqrt5+5-sqrt5)(5+sqrt5)(5-sqrt5)}=frac{1}{10(25-5)}=frac{1}{10cdot20}=boxed{frac{1}{200}}$