$\left(\frac{1}{5}\right)^{-2}+\left(\frac{1}{3}\right)^{-3}-\left(\frac{1}{3}\right)^{-2}$
$\left(3x+1\right)\left(3x-4\right)$
$\lim_{x\to0}\left(\frac{\left(x\right)}{\sqrt{3x^2+1}}\right)$
$\left(\frac{3m^{-1}n^4}{5n^{-4}m^{-3}}\right)^{-2}$
$\lim_{x\to0}\left(\frac{x^k}{e^x}\right)$
$\left(4+2\right)\cdot\left(3-5\right)-2\cdot7$
$\left(-\frac{1}{0}-\left(-\frac{1}{-\infty}\right)\right)+\left(-\frac{1}{\infty}-\left(-\frac{1}{0}\right)\right)$
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