$$5,\ \frac{3x^2}{x^3},0$$

$$x^2,\frac{5x}{5x},\frac{8x^3}{4}$$

$$4x+3,x^{-3}y,0$$

$$\frac{2x^4}{x^5},\ \sqrt[]{3},\ 6x^2$$

$$3a^2b$$

$$-\frac{5}{7}xy$$

$$-abc^2$$

$$m^{-2}$$