$3a\left(4-a\right)-4a\left(a+6\right)$
$\frac{675}{5}$
$\lim_{h\to0}\:\frac{\left(h-2\right)}{x^2+2x+1+h+hx}\:\cdot\left(\frac{1}{h}\right)$
$\frac{dy}{dx}=\frac{5x^2}{4t}$
$\log_x\left(\frac{1}{64}\right)=-6$
$-11\:-4.2$
$4x\:-\:24\:\:>\:24$
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