Question

Помогите!!!!!!!пжжж
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Answer 1

$( frac{4^2}{b^2} -1): ( frac{1}{a} + frac{1}{b} ) =( frac{16}{b^2} -1): frac{b+a}{ab} = \ \ = frac{16-b^2}{b^2} * frac{ab}{b+a} = frac{16-b^2}{b} * frac{a}{b+a} = frac{(16-b^2)a}{b*(b+a)} = frac{16a-ab^2}{b^2+ab}$

Answer 2

$( frac{a^2}{b^2} - 1) : ( frac{1}{a} + frac{1}{b} ) = ( frac{a^2}{b^2} - 1) * ( frac{ab}{b+a}) = \ \ = frac{a^2}{b^2}*( frac{ab}{b+a}) - ( frac{ab}{b+a}) = frac{a^3b}{b^2(b+a)}- frac{ab}{b+a} = frac{a^3b-ab^3}{b^2(b+a)}= \ \ = frac{ab(a^2-b^2)}{b^2(a+b)}= frac{a(a-b)(a+b)}{b(a+b)} = frac{a(a-b)}{b}$