$\lim_{x\to0}\left(\frac{2x^2}{5x^2+1}\right)$
$\frac{\left(2m^3n^{-2}\right)^{-1}}{m^3n^4}$
$\left(\left(x+2\right)-\left(x^2+x-2\right)\right)$
$x-2-6+3x$
$\left(-65\right)\left(28\right)$
$\left(c^7-d\right)\left(d+c^7\right)$
$\left(a^2b^6c^4\right)^{10}$
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