$75\cdot550$
$\frac{2x^4+3x^3-8x^2+1-4x}{x^2-\left(x+1\right)}$
$\left(ab+c\right)\left(a^2b^2-abc+c^2\right)$
$\left(\sqrt{3}-i\sqrt{3}\right)^2$
$3x\:\left(4+y\right)$
$\int\frac{e^{2x}}{e^{2x}+8}dx$
$k\left(x\right)=\frac{x^2-9}{x^2-5x+6}$
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