$6x^2y-20x^2y+5x^2y$
$\lim_{x\to0}\left(\frac{x^2+ab+b}{x^2-1}\right)$
$448\cdot\frac{1}{8}$
$1-2a+2a^2$
$\left(5v\right)^3$
$\left(4\left(\frac{1}{4}\right)+2\left(2\right)\right)\left(18\left(\frac{2}{3}\right)-24\left(\frac{1}{4}\right)\right)+2\left(8\left(\frac{1}{2}\right)+2\right)\left(40\left(\frac{1}{4}\right)+1\right)$
$\:16k^2-\:24k\:+\:9$
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