a/(a^2-ab)-b /(a^2-b^2)=a/(a(a-b))-b/(a-b)(a+b)=(a(a+b)-ab)/(a-b)(a+b) =a/(a^2-b^2)=-√2/3
=1/a-b - b/a^2-b^2=a+b/(a-b)(a+b) - b/(a-b)(a+b)=a+2b/(a-b)(a+b)= √2+2√5/-3
a/(a^2-ab)-b /(a^2-b^2)=a/(a(a-b))-b/(a-b)(a+b)=(a(a+b)-ab)/(a-b)(a+b) =a/(a^2-b^2)=-√2/3
=1/a-b - b/a^2-b^2=a+b/(a-b)(a+b) - b/(a-b)(a+b)=a+2b/(a-b)(a+b)= √2+2√5/-3