$3-\left|1+\left(-3-1\right)-\left(-2\right)\right|+\left(4-6\right)$

$3x^3+5^2-12x-20$

$42mxb\left(48m^2\right)$

$\lim_{x\to infinity}\left(\frac{7x-sin\left(x\right)}{x^2+sin\left(x\right)}\right)$

$\int\frac{1+3y^2}{y}dy$

$\frac{2}{3}m^{2}n-\frac{3}{2}mn^{2}-\frac{7}{6}mn^{2}-\frac{1}{2}m^{2}n-\frac{1}{1}mn^{2}$

$\left(\frac{\frac{1}{3}\left(5\right)}{3}\right)\left(\frac{11}{4}\right)-0.8\left(\frac{1}{2}\right)$