$\frac{5}{\:9}a^2b+\frac{1}{4}ab^2-\frac{1}{3}-\frac{5}{6}a^3+\frac{3}{8}ab^2-6$

$\left(\frac{-5040}{-120}\right)$

$\left(7x^{3\:}-3x+1\right)-\left(9x^2+5x-6\right)$

$\frac{5}{4}\left(x+2\right)\ge2x+1$

$\int_0^1e^5sen\left(t-s\right)ds$

$\left(5x^2-6x+11\right)+\left(-x^2+4x-9\right)$

$4y\:\left(y^2-5y+6\right)$