\(a.y=\dfrac{-3x}{x+2}.\\ \rightarrow D=R/\left\{-2\right\}.\\ b.y=\sqrt{12-3x}.\\ \rightarrow D=(-\infty;4].\\ c.y=\dfrac{3-x}{\sqrt{x-4}}.\\ \rightarrow D=(-\infty;4).\)
\(d.y=\dfrac{x}{\left(x-1\right)\sqrt{3-x}}.\\ \rightarrow D=(-\infty;3)/\left\{1\right\}.\)
\(e.y=\dfrac{\sqrt{5-x}}{x^2-3x-10}.\\ \rightarrow D=\left(-\infty;5\right)/\left\{-2\right\}.\)
\(f.y=\sqrt{2x+1}+\sqrt{4-3x}.\\ \rightarrow D=\left[\dfrac{-1}{2};\dfrac{4}{3}\right].\)
\(g.y=\dfrac{\sqrt{2x-5}+3}{x^2-4x-5}.\\ \rightarrow D=[\dfrac{5}{2};+\infty)/\left\{5\right\}.\)
\(h.y=\dfrac{\sqrt{-x+4}}{x^2-x}.\\ \rightarrow D=(-\infty;4]/\left\{0;1\right\}.\)
