$2,66\:+\:0,14896\:$
$-x-8x+a^2+12a+20$
$6x^2-26x+20$
$\left(3m-3n^2\right)\left(3m-3n^2\right)$
$-81+9a^{10}$
$x^3:x$
$\left(\frac{1}{2}a^3b+\frac{3}{2}ab^3\right)$
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