they are problem that are monomial and polynomial..

(72x^5y^8Z^5)/-12x*y^2z^3

(5x*y^4)^2(-x*y^4)^3

(-15y^3+15y^2+45y)/(-15y)

(3x+1)(3x-1)

(x^2+9)(x^2-9)

(-2a^2-5a