Question

$frac{x - 3 sqrt{x} }{2 sqrt{x } - 6}$

Answer 1

Пусть
$sqrt{x} = a$
$frac{ {a}^{2} - 3a }{2a - 6} = frac{a(a - 3)}{2(a - 3)} = frac{a}{2} = > frac{ sqrt{x} }{2}$