а)
D(y) = [-2; +∞) - нет.
б) 0\\2+x>0\\x>-2" alt="y = \frac{1}{\sqrt{2+x}}\\\sqrt{2+x} > 0\\2+x>0\\x>-2" align="absmiddle" class="latex-formula">
D(y) = (-2; +∞) - нет.
в)
D(y) = (-∞; 2] - ДА.
г) 0\\2 - x > 0\\-x > -2\\x < 2" alt="y= \frac{1}{\sqrt{2-x}}\\\sqrt{2-x} > 0\\2 - x > 0\\-x > -2\\x < 2" align="absmiddle" class="latex-formula">
D(y) = (-∞; 2) - нет.