a) Hàm số xác định khi \(x^2-3x+2\ne0\Leftrightarrow\left\{{}\begin{matrix}x\ne1\\x\ne2\end{matrix}\right.\)
b) Hàm số xác định khi \(\left\{{}\begin{matrix}2x-3\ge0\\-x^2+x+2\ne0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ge\dfrac{3}{2}\\x\ne2\\x\ne-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ge\dfrac{3}{2}\\x\ne2\end{matrix}\right.\)
TXĐ: \(D=[\dfrac{3}{2};+\infty)\backslash\left\{2\right\}\)