Question

помогите мне,плтииитз..

Answer 1

$( frac{b}{b+a} - frac{b-a}{b}) :frac{a}{b} = (frac{b^2-(b^2-a^2)}{b(b+a)})* frac{b}{a} = ( frac{b^2-b^2+a^2}{b(b+a)})* frac{b}{a}= frac{a^2}{b(b+a)} * frac{b}{a} = frac{a}{b+a}$