$\lim_{x\to0}\left(\frac{ln\left(5^x-1\right)}{x+2}\right)$

$\left(3+x\right)\left(2-x\right)<0$

$2\left(-2\right)^4-2\left(-2\right)^3+3\left(-2\right)^2+5\left(-2\right)+10$

$7x-3y;\:x=-2;\:y=-5$

$\left(1+2j\right)\left(2+7j\right)$

$\frac{e^{-1}}{a^{-3}}$

$100x^2y^2-81z^2m^2$