$\left(5-6x\right)\left(5+6x\right)$

$50+x^2>2x^2-50$

$\frac{8x^5+1}{2x^2-1}$

$\left(-\:8\right)\:.\:3\::\:\left(-\:6\right)\:-\:15\::\:\left(-3\right)\:.\:\left(-2\right)\:+\:18\::\:\left(\:-\:1\:-\:2\right)$

$-x+3a-b-4a+4b+5$

$\frac{0,001^2\cdot0,1^{-2}}{100^{3^4}}$

$\lim_{x\to-\infty}\frac{\sqrt{4x^6+1}}{-x^3+2}$