Question

Помогите пожалуйста срочно

Answer 1

$( frac{1}{b + sqrt{ab} } + frac{1}{a - sqrt{ab} } ) times frac{1}{( {a}^{ - 1} + {b}^{ - 1} ) sqrt{ab} } = frac{a - sqrt{ab} + b + sqrt{ab} }{ (b + sqrt{ab} )(a - sqrt{ab} )} times frac{1}{( frac{1}{a} + frac{1}{b} ) sqrt{ab} } = frac{a + b}{(b + sqrt{ab})(a - sqrt{ab} ) } times frac{1}{ frac{b + a}{ab} times sqrt{ab} } = frac{a + b}{(b + sqrt{ab} )(a - sqrt{ab}) } times frac{ab}{(a + b) sqrt{ab} } = frac{ sqrt{ab} }{ab + a sqrt{ab} - b sqrt{ab} - ab } = frac{ sqrt{ab} }{ sqrt{ab} (a - b)} = frac{1}{a - b}$

Answer 2

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