Tính

----- Nội dung ảnh -----
3 + 2x
\frac{5}{10x^{4}y}, \ \frac{-5}{8x^{2}y^{2}}, \ \frac{2}{3xy^{5}}; \\
\frac{4x - 4}{2x(x + 3)}, \ \frac{x - 3}{3x(x + 1)};