Question

Помогите, пожалуйста
https://i.imgur.com/n2IF8m0.png

Answer 1

$frac{a^2-b^2}{ab} :(frac{1}{b} -frac{1}{a} )=frac{a^2-b^2}{ab} :(frac{a-b}{ba} )=frac{(a-b)(a+b)*(ba)}{(ab)*(a-b)} =a+b\a=3frac{15}{19} , b=7frac{4}{19}=3frac{15}{19}+7frac{4}{19}=11$