$\left(-15\right):\left[2-\left(6-1\right)\right]$
$100\cdot\left(-20\right)$
$\left(4k+11\right)\left(4k-11\right)$
$\left(7x+4a\right)\cdot\left(8x-2\right)$
$\lim_{x\to1}\left(\frac{2x}{x-1}-\frac{3}{ln\left(x\right)}\right)$
$2\cdot\left(2^0\right)^3$
$2m^4n^2.2mn^4$
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