Question

Упростите выражение))

Answer 1

$<var>\dfrac{\sqrt7-\sqrt2}{\sqrt7+\sqrt2}-\dfrac{\sqrt7+\sqrt2}{\sqrt7-\sqrt2}=\dfrac1{7-2}((\sqrt7-\sqrt2)^2-(\sqrtt7+\sqrt2)^2)=\\=\dfrac15(-4\sqrt{14})=-\dfrac45\sqrt{14}</var>$