Question

Упростите выражение!​

Answer 1

$( frac{1}{a} + frac{1}{b} ) div ( frac{ {a}^{2} + 2ab + {b}^{2} }{2ab} ) = \ = frac{a + b}{ab} times frac{2ab}{(a + b)^{2} } = frac{2}{a + b}$