$\left|\left(-4+9-1\right)\cdot\left(-1-2\right)\right|-\left|-\left(-5\right)+\left(-7\right)\right|\cdot4$

$\frac{\left(8y^6+1y^3-5x^4\right)}{\left(4x\right)}$

$a^2-2a-3\:\frac{a}{3}$

$2\pi r^2+500\pi r$

$\int_{-1}^0\left(-\sqrt[2]{1-x^2}\right)dx$

$\left(5\cdot9\right)^2$

$123.67\cdot89$