$5^3\cdot5^{-2}$
$3\cdot\left(15-5\right)\cdot\left[6+\left(9-3\right)\right]+\left[6\cdot\left(-8\right):12\right]$
$839^2+09$
$\left(gh\right)^0$
$2mn+4n$
$x^4-9x^2+\frac{-5}{x}-2$
$60\cdot830$
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