a) $y=\frac{\sqrt{x-1}-\sqrt{3-2x}}{|x-1|-1}$
b) $y=\frac{3x-1}{x^2+4}+\sqrt{5-10x}+ \frac{2}{\sqrt{x+1}}$
c) $y=\begin{cases} \frac{\sqrt[3]{x+1}}{x-1} nếu -1 \leq x \leq 0 \\ \frac{x}{x+1} nếu x >0 \end{cases}$