$-8m-12$
$\left(t+u^2\right)^7$
$\left(3x^{3}-x^{2}-20x+13\right):\left(x^{2}+2x-1\right)$
$79a^6b^4+88ab^4$
$lg\left(\frac{8}{75}\right)-lg\left(\frac{9}{25}\right)+lg\left(\frac{81}{16}\right)$
$8^{-9}\cdot8^{11}$
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