$\pi\left(\frac{1}{x}\right)^2$
$2n-118=200$
$6bd\cdot5,8b^2c$
$\int_0^{\infty}\left(5e^{-x}+4e^{-2x}\right)dx$
$\frac{8}{27}a^6+\frac{1}{64}b^3$
$6am-3bm-6am+3bn$
$81-49x^2$
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