Question

$\sqrt{ - \times }$
$\sqrt{ \times - 5}$
$\sqrt{ \times + 9}$
$\sqrt{7 - \times ?}$
​

Answer 1

Ответ:

Область допустимых значений.

$\sqrt{-x}\ \ ,\ \ \ ODZ:\ -x\geq 0\ \ ,\ \ x\leq 0\\\\\\\sqrt{x-5}\ \ ,\ \ \ ODZ:\ x-5\geq 0\ \ ,\ \ x\geq 5\\\\\\\sqrt{x+9}\ \ ,\ \ \ ODZ:\ x+9\geq 0\ \ ,\ \ \ x\geq -9\\\\\\ \sqrt{7-x}\ \ ,\ \ \ ODZ:\ 7-x\geq 0\ \ ,\ \ 7\geq x\ \ ,\ \ x\leq 7$