$\left(3x^5y^2z^7\right)^3$
$\frac{8x}{x+1}=5-\frac{8}{x+1}$
$-x^4-2x^2+x+3;\:x=2$
$\lim_{x\to\infty}\left(\frac{15x^2+2x-1}{\sqrt{9x^4+2x^3}}\right)$
$196x^4-64b^2c^2$
$5x^2-6x\cdot2x-2$
$u^2+6u-16$
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